Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Patent
1994-02-25
1995-07-18
Mullins, James B.
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
330139, 330279, 381109, H03G 310
Patent
active
054345391
ABSTRACT:
Disclosed is a control circuit which provides a control signal to a control terminal of a voltage controlled amplifier (VCA), such as a SSM-2018 VCA manufactured by Analog Devices, such that a signal input to the VCA is amplified between full gain and full attenuation. The VCA is characterized by a predetermined control attenuation relationship which determines the gain of the input signal. The control circuit includes: a DC voltage source, preferably a linear potentiometer, which provides a voltage in a fixed range; an operational amplifier for rescaling the fixed range of voltages to a second range; a pair of curve-shaping circuits which adjust the second range; a scaling circuit, including an amplifier circuit, a voltage divider and a zener diode, which adapts the signal from the DC voltage source to a range of voltages calculated from the control attenuation relationship. This circuitry permits faster adjustment of the control signal over ranges resulting in full attenuation or unity gain without significant increase in noise and distortion in the signal output from the VCA.
REFERENCES:
patent: 4404429 (1983-09-01), Griffis
patent: 5317641 (1994-05-01), Yasuda et al.
Sony MXP-S390/S390R, MXP-P390/P390R, Maintenance Manual, p. 6-3, (First Edition).
"Audio Video Reference Manual 1992," Analog Devices, pp. 7-81 to 7-92, 1992.
Kananen Ronald P.
Mullins James B.
Sony Electronics Inc.
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