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1986-06-02
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329 lines
Note: Print using WS 3.3
Multiple-tuned Amplifier Program
Jack Porter
Cubic Corporation
P. O. Box 85587
San Diego, CA 92138
(619) 277-6780
Permission to publish the above information is granted.
The program was developed using a TRS-80 Model 4 computer with the DOSPLUS
IV operating system and Model 4 Basic, a version of Microsoft Basic which
is very similar to the one used on the IBM PC. The program should run
with very minor changes using any version of Microsoft Basic. The effects
of any statements which are peculiar to Model 4 Basic, DOSPLUS, or the
Gemini 10 printer are explained by remarks in the program at those lines.
The program requires 16K of memory and a monochrome display. The display
formats in the program use 80 columns and 24 lines.
Abstract:
This program is used to design tuned amplifier coupling networks which
consist of one to eight tuned circuits each. These filter networks may
be of any conventional filter type, such as Butterworth, Chebyshev or
Bessel. The program calculates capacitor, inductor and resistor values,
and transformer turns ratios required to form a filter network with a
specified shape, center frequency, and bandwidth which will provide the
desired mismatch ratios for the transistors which are coupled by it.
The program also calculates low-pass prototype element values for
Butterworth and Chebyshev filters. For other types of filters these
must be entered from the keyboard.
Variable Descriptions:
Am: Chebyshev filter passband ripple in dB. Am=0 for Butterworth filters.
Ap: Power gain in dB.
BS, BL: Imaginary parts of source and load admittances.
BW: Bandwidth in MHz.
Ck: Tuning capacitance of k'th tuned circuit in pF.
Ck,k+1: Coupling capacitance between tuned circuits k and k+1.
Ct: Total capacitance at each node in pF.
F0: Design center frequency in MHz.
Fc: Corrected center frequency used in calculations.
GS, GL: Real parts of source and load admittances.
K: Stern stability factor.
L: Tuned circuit inductance in nH.
Mia, Moa: Input and output mismatch ratios for transistor a.
Mib, Mob: Mismatch ratios for transistor b.
MS, ML: Source and load mismatch ratios.
N: Number of tuned circuits.
N1, N2: Turns ratios at filter input and output.
Q0: Reciprocal of filter fractional bandwidth. Q0=Fc/BW.
Q1, Q2: Q's of the first and last tuned circuits in the filter.
QL: Loaded Q of a single-tuned circuit.
Qu: Unloaded circuit Q; approximately equal to inductor Q.
r: Low-pass prototype filter termination resistance for N odd,
or conductance for N even.
R1, R2: Loading resistance values at filter input and output.
S: Alignment sensitivity.
Y11, Y21, Y12, Y22: Transistor short circuit admittance parameters.
Enter these values in data statements in that order,
real part of each Y parameter first.
Yi, Yo: Transistor input and output admittances.
Sample program run showing text which is displayed on the screen:
RUN "TUNEDAMP/BAS"
TUNED AMPLIFIERS 05/12/86
N, Am(dB)? 3, -1
Prototype element values
1 ? 2.2034
2 ? .97051
3 ? .33742
Prototype element values:
1 2.2034 2 .97051 3 .33742
r= 1
Print element values? Y
TUNED AMPLIFIERS N= 3 Am=-1 05/12/86
Transistors:
1. MRF904 10V 2.5mA 180 MHz 2. 2N4957 10V 2.0mA 180 MHz
Coupling network types:
1. Interstage 2. Input 3. Output? 1
Transistors? 1, 2
Mia, Moa, Mib, Mob? 10, 20, 8, 12
Ka= 2.833 Sa= .64357 Kb= 5.0985 Sb= .454846
Are K and S OK? N
Mia, Moa, Mib, Mob? 10, 50, 10, 20
Ka= 6.88015 Sa= .378057 Kb= 10.0663 Sb= .270341
Are K and S OK? Y
TUNED AMPLIFIERS N= 3 Am=-1 05/12/86
Transistors:
1. MRF904 10V 2.5mA 180 MHz 2. 2N4957 10V 2.0mA 180 MHz
Mia= 10 Moa= 50 Mib= 10 Mob= 20
Ka= 6.88015 Sa= .378057 Kb= 10.0663 Sb= .270341
F0(MHz), BW(MHz), Qu? 180, 15, 120
Options: 1. Select C12 2. Select Ct 3. N1=1 4. N2=1? 1
C12(pF)? .5
Fc= 179.844 MHz Ap= 16.5514 dB
Q1= 26.4178 Q2= 4.04552 Qu= 120
R1= 6207.32 R2= 679.082 N1= 2.53424 N2= 2.54096
L= 89.3367 nH Ct= 8.76639 pF
C 1 = 7.80128 C 2 = 6.98868 C 3 = 5.48921
C 12 = .5 C 23 = 1.27771
Print results? Y
New C? N
New M's? N
TUNED AMPLIFIERS N= 3 Am=-1 05/12/86
Transistors:
1. MRF904 10V 2.5mA 180 MHz 2. 2N4957 10V 2.0mA 180 MHz
Coupling network types:
1. Interstage 2. Input 3. Output? 0
TUNED AMPLIFIERS 05/12/86
N, Am(dB)? 2, .1
Specify: 1. Ripple BW 2. 3 dB BW? 2
Prototype element values:
1 1.6545 2 1.22071
r= .737811
Print element values? N
TUNED AMPLIFIERS N= 2 Am= .1 05/12/86
Transistors:
1. MRF904 10V 2.5mA 180 MHz 2. 2N4957 10V 2.0mA 180 MHz
Coupling network types:
1. Interstage 2. Input 3. Output? 2
Transistor? 1
GS, BS, MS, Mib, Mob? .02, 0, 2, 10, 50
K= 6.88015 S= .378057
Are K and S OK? Y
TUNED AMPLIFIERS N= 2 Am= .1 05/12/86
Transistor:
1. MRF904 10V 2.5mA 180 MHz
MS= 2 Mib= 10 Mob= 50
K= 6.88015 S= .378057
F0(MHz), BW(MHz), Qu? 180, 15, 120
Options: 1. Select C12 2. Select Ct 3. N1=1 4. N2=1? 1
C12(pF)? .5
Fc= 179.844 MHz Ap(Transducer)=-5.13807 dB
Q1= 19.8367 Q2= 19.8368 Qu= 120
R1= 12263.2 R2= 5653.23 N1= 7.86234 N2= 4.82723
L= 91.9257 nH Ct= 8.51949 pF
C 1 = 8.01949 C 2 = 7.50881
C 12 = .5
Print results? Y
New C? N
New M's? N
TUNED AMPLIFIERS N= 2 Am= .1 05/12/86
Transistors:
1. MRF904 10V 2.5mA 180 MHz 2. 2N4957 10V 2.0mA 180 MHz
Coupling network types:
1. Interstage 2. Input 3. Output? 0
TUNED AMPLIFIERS 05/12/86
N, Am(dB)? 1, 0
Prototype element values:
1 2
r= 1
Print element values? N
TUNED AMPLIFIERS N= 1 Am= 0 05/12/86
Transistors:
1. MRF904 10V 2.5mA 180 MHz 2. 2N4957 10V 2.0mA 180 MHz
Coupling network types:
1. Interstage 2. Input 3. Output? 3
Transistor? 2
Mia, Moa, ML, GL, BL? 10, 20, 1, .02, 0
K= 10.0663 S= .270341
Are K and S OK? Y
TUNED AMPLIFIERS N= 1 Am= 0 05/12/86
Transistor:
2. 2N4957 10V 2.0mA 180 MHz
Mia= 10 Moa= 20 ML= 1
K= 10.0663 S= .270341
F0(MHz), BW(MHz), Qu? 180, 25, 120
Options: 1. Select C12 2. Select Ct 3. N1=1 4. N2=1? 3
Fc= 179.565 MHz Ap= 20.4109 dB
QL= 7.18262 Qu= 120
R1= 1033.43 N1= 1 N2= 3.50168
L= 37.8275 nH Ct= 20.7677 pF
C 1 = 18.8655
Print results? N
New C? Y
Options: 1. Select C12 2. Select Ct 3. N1=1 4. N2=1? 2
Ct(pF)? 8
Fc= 179.565 MHz Ap= 20.4109 dB
QL= 7.18262 Qu= 120
R1= 2682.74 N1= 1.6112 N2= 5.6419
L= 98.1986 nH Ct= 8 pF
C 1 = 7.26726
Print results? Y
New C? N
New M's? N
TUNED AMPLIFIERS N= 1 Am= 0 05/12/86
Transistors:
1. MRF904 10V 2.5mA 180 MHz 2. 2N4957 10V 2.0mA 180 MHz
Coupling network types:
1. Interstage 2. Input 3. Output? -1
Ready
Printer output from sample program run:
TUNED AMPLIFIERS 05/23/86
N= 3
Prototype element values:
1 2.2034 2 .97051 3 .33742
r= 1
Transistors:
MRF904 10V 2.5mA 180 MHz 2N4957 10V 2.0mA 180 MHz
Y11= +1.730E-03 +5.063E-03j Y11= +2.585E-03 +6.348E-03j
Y21= +6.583E-02 -2.481E-02j Y21= +5.396E-02 -2.084E-02j
Y12= -2.305E-05 -5.248E-04j Y12= -7.264E-08 -4.480E-04j
Y22= +7.946E-05 +1.590E-03j Y22= +1.397E-04 +1.296E-03j
Mia= 10 Moa= 50 Mib= 10 Mob= 20
Ka= 6.88015 Sa= .378057 Kb= 10.0663 Sb= .270341
Yia= +5.317E-03 +1.345E-02j Yib= +5.769E-03 +1.459E-02j
Yoa= +8.434E-04 +3.375E-03j Yob= +4.682E-04 +2.146E-03j
N= 3
F0= 180 MHz BW= 15 MHz Fc= 179.844 MHz
Ap= 16.5514 dB
Q1= 26.4178 Q2= 4.04552 Qu= 120
R1= 6207.32 6 R2= 679.082 6
N1= 2.53424 N2= 2.54096
L= 89.3367 nH Ct= 8.76639 pF
C1= 7.80128 pF
C12= .5 pF
C2= 6.98868 pF
C23= 1.27771 pF
C3= 5.48921 pF
TUNED AMPLIFIERS 05/23/86
Transistor:
MRF904 10V 2.5mA 180 MHz
Y11= +1.730E-03 +5.063E-03j
Y21= +6.583E-02 -2.481E-02j
Y12= -2.305E-05 -5.248E-04j
Y22= +7.946E-05 +1.590E-03j
MS= 2 Mib= 10 Mob= 50
K= 6.88015 S= .378057
GS= .02 BS= 0 Yib= +5.317E-03 +1.345E-02j
Yob= +8.434E-04 +3.375E-03j
N= 2 Am= .1 dB 3 dB BW
F0= 180 MHz BW= 15 MHz Fc= 179.844 MHz
Ap(Transducer)=-5.13807 dB
Q1= 19.8367 Q2= 19.8368 Qu= 120
R1= 12263.2 6 R2= 5653.23 6
N1= 7.86234 N2= 4.82723
L= 91.9257 nH Ct= 8.51949 pF
C1= 8.01949 pF
C12= .5 pF
C2= 7.50881 pF
TUNED AMPLIFIERS 05/23/86
Transistor:
2N4957 10V 2.0mA 180 MHz
Y11= +2.585E-03 +6.348E-03j
Y21= +5.396E-02 -2.084E-02j
Y12= -7.264E-08 -4.480E-04j
Y22= +1.397E-04 +1.296E-03j
Mia= 10 Moa= 20 ML= 1
K= 10.0663 S= .270341
Yia= +5.769E-03 +1.459E-02j
Yoa= +4.682E-04 +2.146E-03j GL= .02 BL= 0
N= 1 Am= 0 dB
F0= 180 MHz BW= 25 MHz Fc= 179.565 MHz
Ap= 20.4109 dB
QL= 7.18262 Qu= 120
R1= 2682.74 6
N1= 1.6112 N2= 5.6419
L= 98.1986 nH Ct= 8 pF
C1= 7.26726 pF