Digital amplifier

Details Digital amplifier Digital amplifier

2007-01-30

2007-01-30

Nguyen, Khanh Van (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S20700P, C330S297000

Reexamination Certificate

active

10944585

ABSTRACT:
To provide a digital amplifier advantageously performing volume adjustment over a wide range. A first and second field effect transistors include N-channel type field effect transistors. The first field effect transistor has the drain connected to the operation voltage Vreg, the source connected to the drain of the second field effect transistor and the gate to which the first input signal is applied from the first level shifter for on/off operation. The second field effect transistor has the source connected to the ground potential as the reference voltage and the gate to which the second input signal is applied from the second level shifter for on/off operation.

REFERENCES:
patent: 4992749 (1991-02-01), Tokumo et al.
patent: 5767740 (1998-06-01), Fogg
patent: 5898340 (1999-04-01), Chatterjee et al.
patent: 6388514 (2002-05-01), King et al.
patent: 6925115 (2005-08-01), Andersen et al.
patent: 2001-202696 (2001-07-01), None
patent: WO 00 72627 (2000-11-01), None
patent: WO 03 055059 (2003-07-01), None
patent: WO 2004 015855 (2004-02-01), None

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