Title:
POWER AMPLIFIER
Document Type and Number:
WIPO Patent Application WO/1982/000739
Kind Code:
A1
Abstract:
A PWM signal power amplifier has a pulse width modulation signal generator circuit for generating a pulse width modulation signal having a width proportional to the amplitude of the input signal, an amplitude modulator circuit for amplitude-modulating the pulse width modulation signal in response to the level of the input signal, and a power amplifier stage driven by the modulated pulse width modulation signal. The amplitude modulator has, for instance, a pair of level shifting circuits (21), (22) to which an input signal is applied, a pair of switching circuits (23), (24) for switching the outputs of the level shifting circuits in accordance with the pulse width modulation signal, and an adder (25) for adding the outputs of the switching circuits. The amplitude modulated pulse width modulation signal can be obtained at the output of the adder, and efficiently drive the power amplifier stage using a bipolar transistor.
More Like This:
| JPS60163510 | AMPLIFIER CIRCUIT |
Inventors:
KOIZUMI A (JP)
YAMAGISHI K (JP)
YAMAGISHI K (JP)
Application Number:
PCT/JP1981/000188
Publication Date:
March 04, 1982
Filing Date:
August 25, 1981
Export Citation:
Assignee:
SONY CORP (JP)
KOIZUMI A (JP)
YAMAGISHI K (JP)
KOIZUMI A (JP)
YAMAGISHI K (JP)
International Classes:
H03F3/20; H03F3/217; (IPC1-7): H03F3/217; H03K7/08
Foreign References:
| JPH05284945A | 1993-11-02 | |||
| JPS55100323U | 1980-07-12 |
Other References:
See also references of EP 0058724A4
Download PDF:
Previous Patent: FAILURE PROTECTION CIRCUIT FOR A TOW-MOTOR LIFT TRUCK
Next Patent: CLOCKED LOGIC CIRCUIT
Next Patent: CLOCKED LOGIC CIRCUIT