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- 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