Amplifiers – With semiconductor amplifying device – Including signal feedback means
Patent
1994-05-16
1995-05-30
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including signal feedback means
330252, 330260, 330265, H03F 114, H03F 345
Patent
active
054205425
ABSTRACT:
A scheme is presented for offsetting varactor error currents that are coupled to the gain nodes of amplifier circuits through transistors having their collectors connected to these gain nodes. For each vatactor error current generating transistor, a compensating diode circuit is connected so as to replicate the vatactor error current, and the replicated current is coupled to the gain node to offset the vatactor error current of the corresponding transistor. In order to replicate the vatactor error current of a given transistor, each compensating diode circuit comprises a diode for which the capacitance and the voltage dependence thereof substantially track those of the collector-base junction of the corresponding transistor. The voltage driving the vatactor error current in the transistor is coupled to one electrode of the compensating diode, the other electrode of which is connected to the emitter of the transistor having its collector connected to the gain node. The replicated error current generated in the compensating diode circuit thus formed is coupled to the emitter of the transistor having its collector connected to the gain node to offset the vatactor error current of the corresponding transistor. Amplifier circuits in which this scheme is implemented are also disclosed.
REFERENCES:
patent: 4713628 (1987-12-01), Nelson
patent: 4751474 (1988-06-01), Gola
patent: 4885548 (1989-12-01), Wakimoto et al.
Elantec, Inc.
Mullins James B.
Novakoski Leo V.
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