Four phase level shift circuit for use in a push-pull amplifier

Details Four phase level shift circuit for use in a push-pull amplifier Four phase level shift circuit for use in a push-pull amplifier

2001-05-24

2002-11-05

Shingleton, Michael B (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C375S238000, C330S20700P, C330S251000

Reexamination Certificate

active

06476672

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention further relates to a level shift circuit for use in such a push-pull amplifier.
The invention further relates to a method of level shifting signals.
From the “Proceedings of the IEEE 1995 Custom Integrated Circuits Conference May 1-4, 1995” a push-pull amplifier is known. One of the items of class D amplifier is that the class D amplifier has the cope with the voltage limitations of the device. To reduce standby power dissipation herein a level shifter is proposed.
A disadvantage of this known push-pull amplifier and level shift circuit is that the herein-proposed solution can only be used with complementary power transistors.
SUMMARY OF THE INVENTION
It is an object of the invention to propose a push-pull amplifier and a level shift circuit, which not have the advantages of the known. To this end a class D amplifier according to the invention comprises the features as claimed in claim
1
.
Embodiments of the invention are described in the dependent claims.
Herewith a cross-reference is made to the following co-pending applications of the same applicant and of the same date:
“Carrousel handshake” applicant's ref. Nr. ID603908, Application No. 0 201 818.2
“Silent start” applicant's ref. Nr. ID604681, Application No. 0 201 827.3
“PWM limiter” applicant's ref. Nr. ID604682, Application No. 0 201 828.1
“Demodulation filter” applicant's ref Nr. ID604683, Application No. 0 201 829.9.


REFERENCES:
patent: A10397241 (1990-05-01), None
patent: 798858 (1997-01-01), None
Tomita Hiroo; “Arm Shortproof Circuit of Transistor Converter”, Fuji Electric Co, Ltd; May 1988, Patent Abstracts of Japan, vol. 012, No. 162, JP62272878.

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