Analog divider with minimal phase distortion

Details Analog divider with minimal phase distortion Analog divider with minimal phase distortion

1985-04-26

1986-12-23

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

307492, 328161, 364850, H04H 500

Patent

active

046317457

ABSTRACT:
An analog divider circuit as for use in AM stereophonic receivers provides minimum phase variation with control voltage level change, by means of a feedback circuit. The division process is performed by subtracting logarithms of currents produced by the dividend and divisor voltages, then deriving the antilog of the difference or remainder. At the critical point in the process, where junction capacitances do not accurately track the change in the control level, cross-coupled capacitors stabilize the circuit by feeding back a signal from the circuit output to minimize any undesired phase changes.

REFERENCES:
patent: 4004141 (1977-01-01), Curtis
patent: 4157512 (1979-06-01), Schmoock
patent: 4353000 (1982-10-01), Noda
patent: 4371747 (1983-01-01), Hilbert
patent: 4404431 (1983-09-01), Watanabe
patent: 4439696 (1984-03-01), Yokoya

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