Negative voltage generator

Details Negative voltage generator Negative voltage generator

1996-05-03

1997-12-16

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including particular power supply circuitry

327536, H03F 304, G05F 110

Patent

active

056990189

ABSTRACT:
An output voltage of a negative voltage generator contains a ripple because of a ripple occurring in a voltage produced by a charge pump circuit in the negative voltage generator. When the negative voltage is supplied to an FET amplifier, there arises a possibility that an unwanted spurious component occurs in an output of the FET amplifier. Since each of pair of circuits, that generate a negative voltage, are made mutually complementary, two charge pump circuits are used to cancel ripples. A ripple appearing in an output voltage can therefore be suppressed, and a negative voltage can eventually be supplied more stably. When the negative voltage generator is connected to, for example, an FET amplifier in order to supply a gate bias voltage to each FET in the FET amplifier, an unwanted spurious component that may be contained in an output of the FET amplifier can be removed.

REFERENCES:
patent: 4794278 (1988-12-01), Vajdic
patent: 5180928 (1993-01-01), Choi
patent: 5532640 (1996-07-01), Okunaga
"Development of a Monolithic Negative Voltage Generator IC for Gain Controlled MMIC Amplifiers" Technical Report of IEICE.ED94-135, pp. 43-49, Jan. 19, 1995.

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