Amplifiers – Combined with automatic amplifier disabling switch means
Patent
1995-02-03
1997-02-04
Mullins, James B.
Amplifiers
Combined with automatic amplifier disabling switch means
327411, 330254, 330295, H03F 368, H03G 330
Patent
active
056002785
ABSTRACT:
A first amplifier channel between an input and output includes an input transistor emitter and a first output transistor emitter connected together to form a first emitter pair. A current source is connected to the emitter pair via a transistor which is controlled by a latch. Programming the latch permits the channel to be turned on or off. The emitter pair is connected to a positive voltage through a resistor and to ground through a diode to force it to a controlled off voltage, which prevents signals from passing when the channel is off. There is a output driver amplifier in a feedback circuit. An outdisable circuit controls the voltage and current of the output driver amplifier to place the output in a state in which it appears electrically as an open circuit when the channel is off. Multiple programmable amplifiers can be combined to make a multiplexer, a selectable gain circuit, or a selectable attenuation circuit, all with high band width and high signal integrity.
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Schoffer, "Monolithic CMOS Video Mux/Amp Pushes 50 MHz" Electronic Engineering, Oct. 1987, pp. 43, 44, 48, 52.
Krylov et al. "Integrated Circuit Analog Switch" Pribory i Tekhnika Eksperimenta, No. 4, Jul.-Aug., 1977, pp. 122-123.
DeBurd et al. "Analog Multiplexing Device", IBM Technical Disclosure Bulletin, vol. 20, No. 7, Dec., 1977, pp. 2722, 2723.
Griggs Keith C.
Uhling Thomas F.
Hewlett--Packard Company
Mullins James B.
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