Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Patent
1994-02-25
1995-06-13
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
054246792
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 +12 dB 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; and a circuit, including an amplifier circuit, a voltage divider and a zener diode, which adds a DC offset and 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 +12 dB 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.
"Audio-Video Reference Manual 1992," Analog Devices, pp. 7-81 to 7-92, 1992.
Sony MXP-S390/S390R, MXP-P390/P390R, Maintenance Manual, p. 6-3, (First Edition).
Kananen Ronald P.
Mullins James B.
Sony Electronics Inc.
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