Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1983-12-13
1985-12-31
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330277, 330294, H03F 316
Patent
active
045624089
ABSTRACT:
An amplifier comprising a pair of differential input MISFETs, a current mirror circuit connected between the drains of the differential input MISFETs and a power source terminal, a phase compensation circuit connected to the drain of one of the differential input MISFETs, an output stage amplification circuit amplifying the signal produced at the drain of one of the differential input MISFETs, a phase regulation circuit such as a capacitor connected to the other of the differential input transistors, and a feedback circuit feeding back the output signal produced from the output stage amplification circuit to the other of the differential input MISFETs in order to apply negative feedback to the amplifier. Since the capacitor is provided, the phase of the power source noise can be made substantially equal to the phase of noise occurring at the drain of one of the differential input MISFETs due to the power source noise. Hence, hardly any noise is produced from the output stage amplification circuit. Since feedback is applied to the amplifier, the noise occurring at the drain of the other of the differential input MISFETs operates in such a manner as to limit the amount of change of the drain voltage of one of the differential input MISFETs due to the noise. As a result, a large change of the output signal due to the power source noise can be prevented. Furthermore, since an element to be added for this purpose may be merely a capacitor, a significant increase in the number of circuit elements can be avoided.
REFERENCES:
patent: 4048575 (1977-09-01), Musa
patent: 4335355 (1982-06-01), Haque
patent: 4379267 (1983-04-01), Young
patent: 4383223 (1983-05-01), Ulmer
patent: 4458212 (1984-07-01), Brehmer et al.
Fujii Fumiaki
Nagai Kenji
Hitachi , Ltd.
Mottola Steven J.
Mullins James B.
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