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Diode-Bridge Voltage-Controlled Attenuator

Public Unreviewed

by John Lauer

Two-layer through-hole audio attenuator: four 1N4148s as a current-biased shunt bridge, 0 to 2 V control, designed by Saif Abdessayed with Adom Hydrogen

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diode-vca-attenuator / simulation / results / large_vc_0p5.log
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John Lauer Saif Abdessayed's diode-bridge VCA: KiCad project, Gerbers, BOM, simulations, reports, and the earlier RC filter test 45f3ff6 11d ago
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Circuit: * diode-bridge voltage-controlled attenuator

Doing analysis at TEMP = 27.000000 and TNOM = 27.000000

Using SPARSE 1.3 as Direct Linear Solver

Initial Transient Solution
--------------------------

Node                                   Voltage
----                                   -------
vcc                                         12
vee                                        -12
ctrl                                       0.5
ctrlf                                  0.49505
in                                           0
bufin                                        0
buf                                          0
out                                          0
bra                                     10.217
bra_i                                   10.217
brb_i                                   10.217
brb                                     10.217
brp                                    10.6536
brn                                    9.78053
opout                                  1.08807
sense                                 0.495039
base                                   1.08511
bop#branch                        -6.29348e-07
e_buf#branch                                 0
vin#branch                                   0
vctrl#branch                       -4.9505e-07
vee#branch                                   0
vcc#branch                        -6.11985e-05


No. of Data Rows : 20001

  Measurements for Transient Analysis

vout_pp             =  1.096660e+01 from=  2.000000e-02 to=  3.000000e-02
vin_pp              =  1.199998e+01 from=  2.000000e-02 to=  3.000000e-02
gain                =  9.13885e-01

Fourier analysis for v(out):
  No. Harmonics: 10, THD: 2.3964 %, Gridsize: 200, Interpolation Degree: 1

Harmonic Frequency   Magnitude   Phase       Norm. Mag   Norm. Phase
-------- ---------   ---------   -----       ---------   -----------
 0       0           0.155988    0           0           0          
 1       1000        5.44992     -0.0072791  1           0          
 2       2000        0.109755    -90.04      0.0201389   -90.033    
 3       3000        0.0518323   -179.85     0.00951066  -179.84    
 4       4000        0.0218485   -90.108     0.00400896  -90.101    
 5       5000        0.0310233   -179.9      0.00569243  -179.89    
 6       6000        0.00939295  -90.181     0.0017235   -90.173    
 7       7000        0.0219817   -179.95     0.00403341  -179.94    
 8       8000        0.00525804  -90.254     0.000964793 -90.247    
 9       9000        0.0168892   179.995     0.00309898  180.002    




Total analysis time (seconds) = 0.271

Total elapsed time (seconds) = 0.274 

Total DRAM available = 3647.488 MB.
DRAM currently available =  569.391 MB.
Maximum ngspice program size =   22.199 MB.
Current ngspice program size =   14.285 MB.

Shared ngspice pages =   11.648 MB.
Text (code) pages =    6.156 MB.
Stack = 0 bytes.
Library pages =    2.953 MB.