RIAA Network Analysis

A RIAA network gain is equal to its impedance ratio. Zout/Zin in absolute values:

network_001


We start from a RC parallel network:

network_002

network_003

network_005

Zout network is R1 C1 parallel with C2 in series:

network_006

Zin network is Zout with R2 in series:

network_007

The result will be:

network_008

Actual Actual Standard
gain response Forward RIAA
20Hz 0.9313 19.55 db 19.5 db
50Hz 0.7164 17.27 db 17 db
100Hz 0.4609 13.44 db 13 db
200Hz 0.2619 8.538 db 8 db
500Hz 0.1346 2.757 db 2.5 db
1000Hz 0.09802 0 db 0 db
2000Hz 0.07402 -2.438 db -2.5 db
10000Hz 0.02155 -13.15 db -13.6 db
20000Hz 0.01098 -19.01 db -19.5 db


M7 RIAA network response:

network_009

Actual Actual Standard
gain response Inverse RIAA
20Hz 0.000618 -20.56 -19.5 db
50Hz 0.000865 -17.64 -17 db
100Hz 0.001419 -13.34 -13 db
200Hz 0.002541 -8.283 -8 db
500Hz 0.004852 -2.662 -2.5 db
1000Hz 0.006593 0 0 db
2000Hz 0.008932 2.637 2.5 db
10000Hz 0.032207 13.777 13.6 db
20000Hz 0.061293 19.366 19.5 db

Another forward type RIAA network as an example:

network_010

Actual Actual Standard
gain response Forward RIAA
20Hz 0.905500 20.389 db 19.5 db
50Hz 0.65073 17.52 db 17 db
100Hz 0.3985 13.26 db 13 db
200Hz 0.223 8.219 db 8 db
500Hz 0.1169 2.613 db 2.5 db
1000Hz 0.08658 0 db 0 db
2000Hz 0.06481 -2.516 db -2.5 db
10000Hz 0.018206 -13.544 db -13.6 db
20000Hz 0.009253 -19.422 db -19.5 db

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Written by Terry Tam