Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1989-09-19
1991-07-02
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
381101, H03F 345
Patent
active
050288830
ABSTRACT:
A tone control circuit having a first differential amplifier and a second differential amplifier. The first differential amplifier comprises first and second transistors whose emitters are connected. The second differential amplifier comprises third and fourth transistors whose emitters are connected. The base and collector of the third transistor are connected to the base of the second transistor and the collector of the first transistor, respectively. The base and collector of the fourth transistor are connected to the base of the first transistor and the collector of the second transistor, respectively. A demodulated signal is input to the differential amplifier, and also to the second different amplifier via a band-pass filter. When a tone control signal is supplied to the bases of the first to fourth transistors, a signal generated by attenuating at least the low-frequency component of the demodulated signal is output from a tone control-signal output terminal connected to the collectors of the first to fourth transistors.
REFERENCES:
patent: 3908172 (1975-09-01), Aschermann et al.
IC Data Book, TA8130Z, Toshiba, pp. 234-243.
Itoh Masashi
Matsumoto Yutaka
Ozaki Yukio
Kabushiki Kaisha Toshiba
Mottola Steven
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