Amplifiers – With semiconductor amplifying device – Including current mirror amplifier
Patent
1989-04-13
1990-06-12
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including current mirror amplifier
307475, H03F 304, H03K 19092
Patent
active
049336487
ABSTRACT:
An enhanced current mirror circuit includes an auxiliary (by-pass) transducer that is effectively coupled in parallel with the current regulation transistor and the gate voltage of which is controlled by a (doped polysilicon) resistor voltage divider. The components of the voltage divider are configured to compensate for a reduction in the size of the principal current control resistor in the current regulation path of the mirror. The auxiliary current (bypass) control circuit effectively compensates for variations in parameters of the components of the current mirror circuit by controllably regulating (bypassing) current that would otherwise flow through the mirror's current control transistor. The voltage divider network is preferably comprised of a plurality of polysilicon resistor elements the configuration of one of which corresponds to the configuration of the principal current control resistor element. The width of another of the resistor elements of the voltage divider network is relatively large. As a result of these resistance parameters, output signal levels are essentially unaffected by material and dimensional changes. Also, the channel length of the bypass control transistor is shorter than that of the current control transistor in order to enhance its sensitivity to manufacturing and operational changes.
REFERENCES:
patent: 4352057 (1982-09-01), Okada et al.
patent: 4825099 (1989-04-01), Barton
Harris Corporation
Mullins James B.
Wands Charles E.
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