Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1986-06-30
1988-01-05
LaRoche, Eugene R.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, H03F 345
Patent
active
047178868
ABSTRACT:
First and second resistors of a resistive network formed in a semiconductive substrate may be individually trimmed. The first and second resistive regions coupled at one end thereof have their other ends provided with metallic contacts. The resistive regions are disposed on the substrate such that current flowing from the first metallic contact to the second metallic contact through the first and second resistive regions causes the resistance of the first resistive region to be preferentially reduced. In contrast, current flowing from the second metallic contact to the first metallic contact through the first and second resistive regions causes the resistance of the second resistive region to be preferentially reduced. The resistive network is used in an operational amplifier circuit so as to permit the input offset voltage to be substantially reduced by selective trimming.
REFERENCES:
patent: 4446613 (1984-05-01), Beinglass et al.
patent: 4517524 (1985-05-01), Davis
Davis William F.
Susak David M.
Vyne Robert L.
Ingrassia Vincent B.
LaRoche Eugene R.
Motorola Inc.
Mottola Steven J.
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