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BGC405
Self-Biased BFP405 l l l l l
SIEGET(R)25- Technology Small SCT598-Package Control Pin For Switching The Device Off Current Easy Adjustable By An External Resistor Voltage Independent Current (2V - 4.5V)
8
7
6
5
1
2
3
4
VPW05982
ESD: Electrostatic discharge sensitive device, observe handling precautions! Type BGC405 Marking 40s Ordering Code (8-mm taped) Q62702-G0091 Pin Configuration Package (circuit Diagram) SCT598 see below
Equivalent Circuit
Vcc
Pin Connections, SCT598
Vr,5
4,Vcc 3, Vb 2, GND 1,RFin
Vc
Active Bias Circuit
Vr RFout
RFout,6 GND,7 Vc, 8
Vb
Q1
Note: Top View
RFin GND
Description
The BGC405 is a silicon self biased RF Transistor (Q1). It offers an adjustable collector current nearly independent from device voltage in the range from 2.0V to 4.5V. Additionally a control pin (Vc) for switching the device off is provided. The collector current can be adjusted by connecting a resistor (Rx) between Vcc and Vr.
High Frequency Products
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Edition A13, 06/00
BGC405
Maximum Ratings Parameter Device current Device voltage Total power dissipation, Ts Control voltage Input Current for pin 1 Junction temperature Ambient temperature range Storage temperature range Thermal Resistance Junction-soldering point
1)
Symbol
Unit 12 4.5 54 Vcc+0.5 380 150 -65...+150 -65...+150 530 mA V mW V A C C C K/W
120C
1)
ICC Vcc Ptot Vc Ir Tj TA Tstg Rth JS
1)TS is measured on the Ground lead at the soldering point to the pcb.
Electrical Specifications (Measured in Test Fixture applying the circuit specified in Figure 1 with Rx=82), Tc=25C, Vcc=3V, ICC7mA unless noted Symbol Parameter Gp NF P-1dB IP3 RLin RLout ton toff Ileak IVcOn IVcOff Vcmin Vcmax
2) 3)
Unit
2
Min 19.5 16.5
Typ 21 18 1.8 2.0 1 0.5 15 15 5 8 1.5 3 3.7 2.5 <10 35 -60
Vcc - 0.3V 0V+0.3V
Max
Power Gain (S21 ) Noise Figure (in 50 System)
f=900MHz f=1.8GHz f=900MHz f=1.8GHz
dB dB dBm dBm dB dB s s A A nA V V
2.1 2.3
Output Power at 1dB Gain Compression f=900MHz (in 50 System) Third Order Intercept Point (Output,Opt) Input Return Loss Output Return Loss On Switching Time
3) 3)
f=1.8GHz f=900MHz f=1.8GHz f=900MHz f=1.8GHz f=900MHz f=1.8GHz
Off Switching Time
Leakage Current In Sleep Mode Controll Pin (Vc) Current in Active Mode Controll Pin (Vc) Current in Sleep Mode Minimum Voltage at Vc for Sleep Mode Maximum Voltage at Vc for Active Mode
2) 2)
A positive sign denotes a current flowing form the Pin to the external circuit. This values are valid for C2=1nF, C3=100pF and 220pF Coupling capacitors at RFin and RFout.
High Frequency Products
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Edition A13, 06/00
BGC405
Power Gain versus Frequency Vcc=3V, Icc=5mA
50 45
Power Gain versus Device Current Vcc=3V
30 f=1 GHz
dB
40 35 Gms
25
dB
2 GHz 20
Gma 30 Gms 2 S21 25
20 IS21I2 15 10 Gma
Gma Gms
3 GHz 15 4 GHz
5 GHz
10
6 GHz
5
5 0 0.1
0
1 10
0
2
4
6
8
10
12
14
GHz f Icc
mA
S21 versus Frequency and Temperature Vcc=3V, Icc=7mA
2
28 26
dB
24 22 20
J=
-40C
J = +27C
S21
2
18
J = +85C
16 14 12 10 0.2
0.6
1
1.4
1.8
2.2
2.6
3
GHz f
High Frequency Products
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Edition A13, 06/00
BGC405
Device Current versus Device Voltage Device Current versus Rx and Temperature Vcc=3V
14
12
mA
10 Rx=56W
mA
12
10
8
Icc
6 Rx=82W
Icc
8
J=
-40C
6
Rx=120W 4
J = +27C
4
2 Rx=680W 0 1 2 3
2
J = +85C
V
4
0 50
250
450
650
Vcc
Rx
Device Current versus Voltage at Vc Vcc=3V; Rx=82
8 7
mA
6 5 4 3 2 1 0 1 2 3
Icc
V VVc
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Edition A13, 06/00
BGC405 Typical Application
Vcc,4
C4,150pF C5,100nF
3V, DC
D1
Rx
R2 (500R)
Vr,5
C3, 100pF
D2 Q2 L1,100nH
RFout,6
R1 (47k) R4 (2k7) Q1 R3 10k
Rx = 82Ohm for Icc=7.2mA
Vc,8
Vb,3
C2, 1nF
RFin,1
GND,7,2
off
on
Figure 1. Typical Application and Internal Circuit
Remarks:
1) 2) 3) 4) To provide low frequency stability C2 should be 10 times C3. Be aware that also coupling capacitors determine the switching times. The collector current at Q1 can be estimated by Ic=0.6V / Rx[]. Place C2 as close to the device as possible.
High Frequency Products
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Edition A13, 06/00
BGC405 Layout Proposal
LQ
C7
9F
BG 405 C
C6 L1 C3
C2 C4 C5
Rx
9 %*&
Figure 2. Layout Proposal
Part List for Vcc=3V, ICC7mA Component Value L1 C2 C3 C4 C5 C6 C7 Rx Substrate BGC405
This proposal demonstrates how to use the BGC405 as a Self-Biased Transistor. As for a discrete Transistor matching circuits have to be applied. A good starting point for various applications are the Application Notes provided for the BFP405. 100nH 1nF 100pF 150pF 100nF 220pF 220pF 82 h=0.5mm
Comment
RFC Compensation Capacitor for Low Frequency Stabilization RFC Blocking Capacitor Blocking Capacitor Coupling Capacitor Coupling Capacitor Current Adjust Fr4,r=4.5
High Frequency Products
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Edition A13, 06/00
BGC405
SPICE Model
The following SPICE Listing describes the circuit shown in figure 3. It is valid for low frequencies. For frequencies above 100MHz the parasitic circuit elements noted in figure 4 and table 1 should be added.
Vcc
V1
X3
Rx
2
R2
Vr
C3
X4
3
X2 L1
RFout
R1 R4 Q1 R3 C6 Rout
Vc,4
V2
Vb
C2 C7
RFin
GND
vin
Rin
Figure. 3: Circuit used in the SPICE File
* Preliminary SPICE Model for BGC405 .PARAM R=82 ** Analysis setup ** *.TRAN 2ns 15u 0 2n .TEMP +27 -40 +85 .DC LIN V1 0V 4V 0.1V *.DC LIN V2 0V 3V 0.1V *.STEP PARAM R LIST 33 47 68 100 150 * Voltage V1 Vcc V2 Vc *Vpul Vc supply 0 0 0 DC 3.0V DC 0.0V PULSE(0 3V 100ns 0 0 9us 1000m)
High Frequency Products
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Edition A13, 06/00
BGC405
* Internal Resistors R1 3 Vc 47k R2 Vr 2 500 R3 Vb 0 10k R4 Vb rfin 2.7k * External Resistors Rx Vcc Vr {R} Rout vout 0 50 Rin vin 0 50 * External Capacitors C2 C3 C7 C6 Vb 0 Vr 0 rfin vin rfout vout 1nF 100pF 220pF 220pF
TC=-0.0006,0.0000025 TC=-0.0006,0.0 TC=-0.0006,0.0000025 TC=-0.0006,0.0 TC=+0.000050,0.0
* Inductors (external) L1 Vr rfout 100nH
* Transistors Q1 rfout rfin 0 X2 2 3 Vb 0 X3 Vcc 5 5 0 X4 5330 .PROBE .MODEL BFP405 NPN( + IS = 1.9969e-16 + VAF = 39.251 + NE = 1.7763 + VAR = 34.368 + NC = 1.3152 + RBM = 1.3491 + CJE = 3.7265e-15 + TF = 4.5899e-12 + ITF = 0.0013364 + VJC = 0.99532 + TR = 1.4935e-09 + MJS = 0 + XTI = 3 * PNP:
BFP405 8PL18 2PL18 2PL18
BF = 83.23 IKF = 0.16493 BR = 10.526 IKR = 0.25052 RB = 15 RE = 1.9289 VJE = 0.70367 XTF = 0.3641 PTF = 0 MJC = 0.48652 CJS= 0 XTB = 0 FC = 0.99469)
NF = 1.0405 ISE = 1.5761e-14 NR = 0.96647 ISC = 3.7223e-17 IRB = 0.00021215 RC = 0.12691 MJE = 0.37747 VTF = 0.19762 CJC = 9.6941e-14 XCJC = 0.08161 VJS = 0.75 EG = 1.11
PL18 E B C Bulk 3 2 3 3 993 1 94 94 94 94 TL18 8 VSL18 8 LSL18 8 0.204
.SUBCKT 8PL18 Q1 993 2 Q2 94 2 Q3 94 2 RCEX 993 1 .ENDS
High Frequency Products
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Edition A13, 06/00
BGC405
.SUBCKT 2PL18 Q1 993 2 Q2 94 2 Q3 94 2 RCEX 993 1 .ENDS ***** .MODEL +IS +NE +BR +VAF +IKR +RBM +XTB +CJE +TF +ITF +MJC +CJS +PTF ***** .MODEL +IS +NE +BR +VAF +IKR +RBM +XTB +CJE +TF +ITF +MJC +CJS +PTF ***** .MODEL +IS +NE +BR +VAF +IKR +RBM +XTB +CJE +TF +ITF +MJC +CJS +PTF ***** .END
3
2 3 3 993
1 94 94 94
94 TL18 2 VSL18 2 LSL18 2 0.816
TL18 = 2.914E-17 = 1.553E+00 = 2.869E+01 = 6.000E+01 = 2.474E-05 = 4.000E+01 =-6.000E-01 = 1.200E-14 = 7.600E-10 = 1.400E-02 = 3.760E-01 = 0.000E+00 = 0.000E+00 VSL18 1.630E-19 1.500E+00 1.000E+09 1.000E+02 1.000E+00 0.000E+00 0.000E+00 0.000E+00 2.000E-09 1.000E+06 3.770E-01 0.000E+00 0.000E+00 LSL18 4.261E-17 1.500E+00 1.000E+09 6.000E+01 1.000E+00 0.000E+00 0.000E+00 0.000E+00 1.000E-09 1.000E+06 3.000E-01 0.000E+00 0.000E+00
PNP NF ISE NC IKF RB RE EG VJE XTF CJC XCJC VJS FC PNP NF ISE NC IKF RB RE EG VJE XTF CJC XCJC VJS FC PNP NF ISE NC IKF RB RE EG VJE XTF CJC XCJC VJS FC
= = = = = = = = = = = = =
1.000E+00 6.923E-16 1.500E+00 1.676E-04 6.000E+01 2.597E+00 1.156E+00 4.900E-01 2.872E-01 4.700E-13 1.000E+00 7.500E-01 5.000E-01
BF NR ISC VAR IRB RC XTI MJE VTF VJC TR MJS
= = = = = = = = = = = =
4.005E+02 1.000E+00 8.190E-15 2.214E+00 0.000E+00 4.000E+00 3.000E+00 1.360E-01 1.000E+03 7.610E-01 0.000E+00 0.000E+00
= = = = = = = = = = = = =
= = = = = = = = = = = = =
1.000E+00 0.000E+00 2.000E+00 1.794E-04 0.000E+00 0.000E+00 1.122E+00 6.800E-01 0.000E+00 1.950E-13 0.000E+00 7.500E-01 5.000E-01
BF NR ISC VAR IRB RC XTI MJE VTF VJC TR MJS
= = = = = = = = = = = =
1.000E+09 1.000E+00 0.000E+00 1.700E+00 0.000E+00 0.000E+00 3.000E+00 3.400E-01 1.000E+03 5.500E-01 0.000E+00 0.000E+00
= = = = = = = = = = = = =
= = = = = = = = = = = = =
1.000E+00 0.000E+00 2.000E+00 9.648E-05 0.000E+00 0.000E+00 1.158E+00 6.800E-01 0.000E+00 0.000E+00 0.000E+00 7.500E-01 5.000E-01
BF NR ISC VAR IRB RC XTI MJE VTF VJC TR MJS
= = = = = = = = = = = =
1.000E+09 1.000E+00 0.000E+00 1.700E+00 0.000E+00 0.000E+00 3.000E+00 3.400E-01 1.000E+03 4.600E-01 0.000E+00 0.000E+00
High Frequency Products
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Edition A13, 06/00
BGC405
Vcc
V1
X3
Rx
2
R2
Vr
C3
X4
3
X2 L1
RFout
R1 Lp1 Lp7 R4 Lp2 Q1 R3 Lp6 Cp1
Cp3
Lp3 Cp2
Lp5
Lp4
Vc
V2
Vb
RFin
GND
C2
Figure 4. Parasitic circuit elements for frequencies above 100MHz
Element Lp1 Lp2 Lp3 Lp4 Lp5 Lp6 Lp7 Cp1 Cp2 Cp3
Value
0.58nH 0.56nH 0.23nH 0.05nH 0.53nH 0.47nH 1nH 134fF 136fF 6.9fF
Table 1. Parasitic circuit elements for frequencies above 100MHz
High Frequency Products
10
Edition A13, 06/00

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