Mean Squaring Circuit

Model SQ-1 generates the mean of the square of an
input signal for measuring distortions below -100 dB
with the use of a Fast Fourier Analysis method.

Input Frequency 10 ~ 30 MHz (Optional 10 to 300 MHz)
Output Frequency DC to 30 KHz
Maximum Usable Input -15 dBm (50 Ω)
Output Nominal 2 Volts DC for -15 dBm Input
Offset Voltage < 0.005 Volts
Input Level for 3 dB S/N Ratio w/ Output Bandwidth of 1 Hz -75 dBm
Power Required ±15 V DC, 30 mA


Block diagram