Amplifiers – Combined with automatic amplifier disabling switch means
Patent
1981-10-30
1984-06-19
Mullins, James B.
Amplifiers
Combined with automatic amplifier disabling switch means
330 9, 330107, 330298, H03F 114
Patent
active
044555342
ABSTRACT:
Multi-state control circuitry is described that can selectively couple an input signal to the positive and negative inputs of an operational amplifier depending on the voltage of a control signal. The input signal is coupled to the operational amplifier by a switch, which is enabled or disabled by the output of a voltage detector. The voltage detector enables the switch when the voltage of the control signal is less than a threshold voltage, and disables the switch when the voltage of the control signal is greater than the threshold voltage. The amplification of the operational amplifier is switched between +1 and -1 by selectively coupling a DC voltage to the positive input of the operation amplifier, depending on the current of the control signal. The DC voltage is coupled to the positive input of the operational amplifier by a second switch, which is enabled or disabled by a current detector. The current detector enables the second switch when the current of the control signal is less than a threshold current, and disables the second switch when the current of the control signal is greater than the threshold current.
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"Portable Telephones for Cellular Systems", by Albert J. Leitich & Donald L. Linder, Motorola, Inc., Chicago Corporate R&D Center, 80CH1601-4, Copyright 1980, Vehicular Technology Society IEEE.
FCC Form #401-"An Application for a Developmental Cellular Mobile and Portable Radio Telephone System in the Washington-Baltimore Northern Virginia Area," submitted by: American Radio Telephone Service, Inc.,-1600 Crt. Sqr. Building-Baltimore MD 21202, pp. 4-76 through 4-86.
Gillman James W.
Hackbart Rolland R.
Motorola Inc.
Mullins James B.
Roney Ed
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