Amplifiers – With semiconductor amplifying device – Including signal feedback means
Patent
1981-07-27
1983-11-15
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including signal feedback means
330107, H03F 134, H03F 3183
Patent
active
044158688
ABSTRACT:
In an integrated circuit audio power amplifier a 6 db per octave frequency-gain roll off is obtained in a conventional manner by converting a high gain inverter to an integrator and driving the integrator from a current source. A second cascaded stage is also provided so that it operates at lower gain and has a matching high frequency roll off. When such characteristics are combined in cascade the result is a 12 db per octave roll off at the higher frequencies. A flat negative feedback loop is employed to maintain a controlled constant low frequency gain. In the response region located between the 12 db per octave slope region and the constant gain region there is a 6 db per octave slope. The configuration is stable without resorting to frequency sensitive feedback. When such an amplifier is constructed to have its gain versus frequency roll off to unity at the low frequency end of the AM radio broadcast band, the amplifier will emit very little energy in the radio band, yet a sufficient audio bandwidth is available for Hi Fi response.
REFERENCES:
patent: 4205276 (1980-05-01), Wright et al.
Mullins James B.
National Semiconductor Corporation
Pollock Michael J.
Wan Gene
Winters Paul J.
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