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| RF2942 0 Typical Applications * 915MHz ISM Band Products * Digital Communications * Quadrature Modulation * Portable Battery-Powered Equipment UHF QUADRATURE MODULATOR AND TRANSMITTER Product Description -A- 2 PLCS 0.25 C A The RF2942 is an integrated power amplifier and quadrature modulator IC. The quadrature modulator is driven with a single-ended local oscillator (LO) source. The quadrature phase generation of the LO is accomplished using an internal passive network tuned for twice the operating frequency. The LO frequency is at twice the RF frequency to avoid interfering with an external synthesizer. 4.00 SQ. 2.00 TYP 0.25 C B 2 PLCS 1.00 0.85 0.80 0.65 0.05 C 0.05 0.01 Dimensions in mm. 12 MAX 0.20 C B 2 PLCS -B- 1.88 TYP 3.75 SQ. -C- SEATING PLANE 2 PLCS 0.20 C A 0.10 M C A B Shaded lead is pin 1. 0.60 0.24 TYP 0.35 0.23 0.65 0.30 4 PLCS 1.85 SQ. 1.55 0.23 0.13 4 PLCS 0.65 0.75 0.50 Optimum Technology Matching(R) Applied Si BJT Si Bi-CMOS InGaP/HBT GaAs HBT SiGe HBT GaN HEMT GaAs MESFET Si CMOS SiGe Bi-CMOS Package Style: QFN, 16-Pin, 4x4 Features * 2.0V to 3.6V Power Supply * 902MHz to 928MHz Frequency Range I DATA+ I DATA- TX EN * 200mW Output Power * Low LO Input Level * Low Broadband Noise Floor * Small Footprint 4 3 12 LO IN+ 14 LO2 OUT 15 /2 +45 -45 9 RF OUT 2 Q DATA+ 1 Q DATA- Ordering Information RF2942 RF2942 PCBA UHF Quadrature Modulator and Transmitter Fully Assembled Evaluation Board Functional Block Diagram RF Micro Devices, Inc. 7628 Thorndike Road Greensboro, NC 27409, USA Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com Rev A4 040115 11-195 RF2942 Absolute Maximum Ratings Parameter Supply Voltage Power Down Voltage (VPD) Input LO and RF Levels Operating Ambient Temperature Storage Temperature Rating -0.5 to +3.6 VCC +0.4 +6 -40 to +85 -40 to +150 Unit VDC VDC dBm C C Caution! ESD sensitive device. RF Micro Devices believes the furnished information is correct and accurate at the time of this printing. However, RF Micro Devices reserves the right to make changes to its products without notice. RF Micro Devices does not assume responsibility for the use of the described product(s). Parameter Power Supply Voltage Current Specification Min. Typ. Max. 2.8 2.0 170 10 225 3.6 260 24 Unit V V mA mA MHz dBm Condition Specifications Operating limits TXEN=0.0V T=25 C, VCC =2.8V Carrier Input (LO IN) Frequency Range Power Level Input Impedance -15 1800 to 1860 -6 50 2 400 +2 0.2 >10 10 1830MHz 50 source, I,Q=400mVp-p Differential Modulation Input Frequency Range Modulation for POUT Power (I & Q) Quadrature Phase Error I/Q Amplitude Imbalance Input Impedance DC MHz mVP-P dB k T=25C, VCC =2.8V, LO power=-6dBm, SSB, I/Q=400mVP-P sine wave, 500kHz VCC =3.0V VCC =2.8V +5 RF Output Power Output Second Harmonic Output Third Harmonic Output Sideband Suppression Carrier Suppression 21 -20 -35 -25 -25 23 22 -25 -45 -40 27 dBm dBm dBc dBc dBc dBc Modulation DC offset can be externally adjusted for optimum suppression. Carrier suppression is then typically better than 40dB. Broadband Noise Floor -90 dBm/Hz 11-196 Rev A4 040115 RF2942 Pin 1 Function QSIGDescription Reference voltage for the I and Q mixer. This voltage should be the same as the DC voltage supplied to the I and Q SIG pin. To obtain a carrier suppression of better than 40dB it may be tuned 0.15V (relative to the I and Q SIG DC voltage). Without tuning, the carrier suppression will typically be better than 25dB. The input impedance of this pin is typically >10 k. Interface Schematic DATA+ DATA BIAS 2 3 4 QSIG+ ISIGISIG+ Same as pin 1, except complementary input. Same as pin 4, except complementary input. This pin is used to supply Vcc to the modulator circuits. A RF bypass capacitor should be connected directly to this and ground. Baseband input to the I mixer. A DC bias of approximately 1.2V is present at this pin.A DC blocking capacitor is needed if the signal has a different DC level. Maximum output power is obtained when the input signal has a peak to peak amplitude of 1V. The input impedance of this pin is about 3 k. The SIG- and SIG+ inputs are interchangeable. If swapping the I SIG+ and I SIG- pins, the Q SIG+ and Q SIG- also need to be swapped to maintain the correct phase. The SIG+ and SIG- pins may be driven differentially for BPSK to increase conversion gain. No connection. See pin 1. See pin 1. See pin 1. 5 6 7 8 9 N/C GND PA VCC N/C RF OUT Voltage supply for PA driver. No connection. Power Amp output, open collector output. VCC3 RF OUT 10 11 12 13 14 N/C VCC3 TX EN VCC1 LO IN No connection. Voltage supply for PA buffer. TX enabled when >2.0V. When TX EN is held low, only the LO buffer, LO divider and LO divider buffer are left on. To power all of the circuitry down, TX EN and VCC1 must be held low. Voltage supply for LO buffer and divider. The LO input level should be greater than -15dBm for proper operation. LO IN+ LO IN- BIAS 15 16 LO/2 OUT VCC2 LO divide-by-2 output. Voltage supply for mixers. Rev A4 040115 11-197 RF2942 Pin Out LO DIV2 VCC2 LO IN 14 VCC1 13 12 TX EN 11 VCC3 10 NC 9 RF OUT 5 NC 6 PA GND 7 PA VCC 8 NC 16 QSIG- 1 QSIG+ 2 ISIG- 3 ISIG+ 4 15 11-198 Rev A4 040115 RF2942 Theory of Operation Modulator The modulator is a direct conversion double balanced quadrature mixer architecture. The local oscillator signal is buffered then split with internal phase shifters that are optimized for twice the operating frequency. The LO buffer provides isolation from load changes that may occur as the power amplifier section is turned on and off. In addition, the LO buffer may be left on when the transmit section is turned off to prevent load pulling of the external oscillator, by holding TX EN low and leaving the bias on VCC1. The baseband I and Q pins are connected to the internal mixer bias, therefore it is recommended that the modulation signal be DC-blocked if a similar external reference voltage cannot be provided. The baseband drive may be either single-ended with the complementary input AC-grounded with a capacitor or driven differentially. Power Amplifier The power amplifier requires matching on the output (RF OUT) and the interstage transistor (PA VCC). Rev A4 040115 11-199 RF2942 Evaluation Board Schematic - 915MHz (Download Bill of Materials from www.rfmd.com). VCC2 J1 LO DIV2 VCC1 J2 LO R1 15 k VCC5 C1 0.1 nF R2 10 k R3 15 k VCC5 J5 Q SIG+ C2 0.1 nF R4 10 k R5 15 k VCC5 C3 0.1 nF C22 22nF C21 22 pF J4 Q SIG- C20 5.0 pF L5 18 nH L4 6.8 nH C19 22 pF C17 22 nF C18 0.5 pF C16 22 pF J6 I SIG- TX EN 16 R6 10 k 1 2 3 4 R8 10 k 5 6 7 8 15 14 13 12 11 10 9 L3 3.3 nH C9 5 pF L2 56 nH C7 22 pF C8 22 nF C10 22 pF C11 22 pF C12 22 nF C14 22 pF C15 22 nF R7 15 k VCC5 J7 I SIG+ C4 0.1 nF VCC3 J3 RF OUT P1 P1-1 1 2 CON2 P2 P2-1 1 2 CON2 P4-3 PA VCC GND P4-1 VCC2 GND P3-3 P3-1 P3 1 2 3 CON3 P4 1 2 3 CON3 VCC1 GND TX EN VCC3 GND VCC4 P5-1 P5 1 2 CON2 VCC5 GND L1 5.6 nH R9 160 R10 2 VCC4 C5 22 pF C6 22 nF PA VCC 11-200 Rev A4 040115 RF2942 Evaluation Board Layout Board Size 1.4" x 1.5" Board Thickness 0.032", Board Material FR-4, Multi-Layer Rev A4 040115 11-201 RF2942 Graphs Unless swept, the conditions for the subsequent graphs are as follows. All cable losses accounted for in measurements. VCC=2.8V LO Frequency=1830MHz LO Amplitude=-6dBm I/Q Frequency=1MHz I/Q Amplitude=400mVP-P I/Q Phase=90 POUT versus VCC Over Temperature 30.0 29.0 28.0 27.0 26.0 23.5 25.0 24.0 -40.0C 25.0C 85.0C POUT versus LO Amplitude Over Temperature 25.0 24.5 -40.0C 25.0C 85.0C POUT (dBm) 23.0 22.0 21.0 20.0 POUT (dBm) 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 24.0 23.0 22.5 22.0 21.5 19.0 18.0 17.0 20.5 16.0 15.0 20.0 -15.0 -12.0 -9.0 -6.0 -3.0 0.0 21.0 VCC (V) LO Amplitude (dBm) POUT versus LO Frequency Over Temperature 25.0 24.5 24.0 23.5 -40.0C 25.0C 85.0C POUT versus I/Q Amplitude Over Temperature 25.0 24.5 24.0 23.5 -40.0C 25.0C 85.0C POUT (dBm) 22.5 22.0 21.5 21.0 20.5 20.0 1800.0 1810.0 1820.0 1830.0 1840.0 1850.0 1860.0 POUT (dBm) LO Frequency (MHz) 23.0 23.0 22.5 22.0 21.5 21.0 20.5 20.0 250.0 300.0 350.0 400.0 450.0 500.0 550.0 600.0 650.0 700.0 750.0 I/Q Amplitude (mVP-P) 11-202 Rev A4 040115 RF2942 Idle Current versus VCC Over Temperature 350.0 -40.0C 25.0C 85.0C ICC versus VCC Over Temperature 350.0 -40.0C 25.0C 85.0C 300.0 300.0 250.0 250.0 Idle Current (mA) 150.0 ICC (mA) 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 200.0 200.0 150.0 100.0 100.0 50.0 50.0 0.0 0.0 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 VCC (V) VCC (V) POUT 2f0 versus VCC Over Temperature -23.5 -24.0 -24.5 -25.0 -20.0 -40.0C 25.0C 85.0C POUT 3f0 versus VCC Over Temperature 0.0 -40.0C 25.0C 85.0C -10.0 POUT 2f0 (dBc) -25.5 -26.0 -26.5 -27.0 -27.5 POUT 3f0 (dBc) -30.0 -40.0 -50.0 -60.0 -28.0 -28.5 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 -70.0 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 VCC (V) VCC (V) Carrier Suppression versus VCC Over Temperature 0.0 -40.0C 25.0C 85.0C 0.0 Carrier Suppression versus LO Amplitude Over Temperature -40.0C 25.0C 85.0C -5.0 -5.0 Carrier Suppression (dBc) -10.0 Carrier Suppression (dBc) -10.0 -15.0 -15.0 -20.0 -20.0 -25.0 -25.0 -30.0 -30.0 -35.0 -40.0 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 -35.0 -15.0 -12.0 -9.0 -6.0 -3.0 0.0 VCC (V) LO Amplitude (dBm) Rev A4 040115 11-203 RF2942 0.0 Carrier Suppression versus LO Frequency Over Temperature -40.0C 25.0C 85.0C 0.0 Carrier Suppression versus I/Q Amplitude Over Temperature -40.0C 25.0C 85.0C -5.0 -5.0 -10.0 Carrier Suppression (dBc) -10.0 Carrier Suppression (dBc) 1810.0 1820.0 1830.0 1840.0 1850.0 1860.0 -15.0 -15.0 -20.0 -20.0 -25.0 -25.0 -30.0 -30.0 -35.0 -35.0 1800.0 -40.0 250.0 375.0 500.0 625.0 750.0 LO Frequency (MHz) I/Q Amplitude (mVP-P) Carrier Suppression versus I/Q Phase Over Temperature 0.0 -40.0C 25.0C 85.0C Image Suppression versus VCC Over Temperature 5.0 0.0 -5.0 -10.0 -40.0C 25.0C 85.0C -5.0 Carrier Suppression (dBc) Image Suppression (dBc) -10.0 -15.0 -20.0 -25.0 -30.0 -35.0 -40.0 -45.0 -15.0 -20.0 -25.0 -30.0 -50.0 -55.0 -35.0 80.0 85.0 90.0 95.0 100.0 -60.0 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 I/Q Phase (degrees) VCC (V) 0.0 -5.0 -10.0 Image Suppression versus LO Amplitude Over Temperature -40.0C 25.0C 85.0C 0.0 -5.0 -10.0 Image Suppression versus LO Frequency Over Temperature -40.0C 25.0C 85.0C Image Suppression (dBc) -15.0 -20.0 -25.0 -30.0 -35.0 -40.0 -45.0 -50.0 -15.0 -12.0 -9.0 -6.0 -3.0 0.0 Image Suppression (dBc) -15.0 -20.0 -25.0 -30.0 -35.0 -40.0 -45.0 -50.0 1800.0 1810.0 1820.0 1830.0 1840.0 1850.0 1860.0 LO Amplitude (dBm) LO Frequency (MHz) 11-204 Rev A4 040115 RF2942 0.0 -5.0 -10.0 Image Suppression versus I/Q Amplitude Over Temperature -40.0C 25.0C 85.0C Image Suppression versus I/Q Phase Over Temperature 0.0 -40.0C 25.0C 85.0C -10.0 Image Suppression (dBc) -15.0 -20.0 -25.0 -30.0 -35.0 -40.0 Image Suppression (dBc) -20.0 -30.0 -40.0 -50.0 -60.0 -45.0 -50.0 250.0 300.0 350.0 400.0 450.0 500.0 550.0 600.0 650.0 700.0 750.0 -70.0 80.0 85.0 90.0 95.0 100.0 I/Q Amplitude (mVP-P) I/Q Phase (degree) LODiv2 Out versus VCC Over Temperature 0.0 -1.0 -2.0 -3.0 -40.0C 25.0C 85.0C LODiv2 Out versus LO Amplitude Over Temperature 0.0 -40.0C 25.0C 85.0C -2.0 LO Div2 Out (dBm) -5.0 -6.0 -7.0 -8.0 -9.0 -10.0 -11.0 -12.0 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 LODiv2 Out (dBm) -4.0 -4.0 -6.0 -8.0 -10.0 -12.0 -15.0 -12.0 -9.0 -6.0 -3.0 0.0 VCC (V) LO Amplitude (dBm) LODiv2 Out versus LO Frequency Over Temperature 0.0 -1.0 -2.0 -3.0 -40.0C 25.0C 85.0C LODiv2 Out versus I/Q Amplitude Over Temperature 0.0 -1.0 -2.0 -3.0 -40.0C 25.0C 85.0C LO Div2 Out (dBm) -5.0 -6.0 -7.0 -8.0 -9.0 -10.0 -11.0 -12.0 1800.0 1810.0 1820.0 1830.0 1840.0 1850.0 1860.0 LO Div2 Out (dBm) -4.0 -4.0 -5.0 -6.0 -7.0 -8.0 -9.0 -10.0 -11.0 -12.0 250.0 375.0 500.0 625.0 750.0 LO Frequency (MHz) I/Q Amplitude (mVP-P) Rev A4 040115 11-205 RF2942 11-206 Rev A4 040115 |
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