Sakai, Koichi;

Full-wave rectifier circuit

In a full-wave rectifier circuit, a sinusoidal signal is applied to a differential amplifier, first and second current mirror circuits obtain outputs from the differential amplifier which are opposite in phase to each other. Outputs of the first and second current mirror circuits are applied respectively to the input and output sides of a third mirror circuit and other outputs of the first and second current mirror circuits are applied respectively to the input and output sides of a fourth mirror circuit. The connecting point of the first and fourth current mirror circuits is connected to the base of a first emitter-follower-connected transistor, while the connecting point of the second and third current mirror circuits is connected to the base of a second emitter-follower-connected transistor. The connecting points are connected to a current source circuit. The first and second emitter-follower-connected transistors have their emitters connected together, to provide a full-wave-rectified output.

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What is claimed is:

1. A full-wave rectifier circuit comprising:

a differential amplifier for receiving a sine wave input signal;

first and second current mirror circuits for obtaining outputs from said differential amplifier, said outputs comprising a direct current component and a sine wave signal superposed thereon, said outputs being opposite in phase to each other;

a third current mirror circuit comprising a first transistor, an output of said second current mirror circuit being applied to said first transistor, said first transistor being biased by a bias source which is obtained from an output of said first current mirror circuit; p1 a fourth current mirror circuit comprising a second transistor, an output of said first current mirror circuit being applied to said second transistor, said second transistor being biased by a bias source which is obtained from an output of said second current mirror circuit;

a first current source connected to a first connecting point between said second and third current mirror circuits;

a second current source connected to a second connecting point between said first and fourth current mirror circuits;

a third transistor having a base connected to said first connecting point, said third transistor being emitter-follower-connected; and

a fourth transistor having a base connected to said second connecting point, said fourth transistor being emitter-follower-connected, collectors of said third and fourth transistors being commonly connected and emitters of said third and fourth transistors being commonly connected; whereby said third and fourth transistors are operative alternatively with a half period of said sine wave input signal to said differential amplifier to obtain a full-wave rectified output from a common connecting point of said emitters of said third and fourth transistors.

2. A circuit as claimed in claim 1, in which each of said first and second current mirror circuits comprise multi-collector transistors.

3. A full-wave rectifier circuit comprising:

a differential amplifier to which an input signal comprising a sine wave is supplied, an active load of said differential amplifier comprising first and second current mirror circuits having a plurality of output terminals which obtain outputs from said differential amplifier which are opposite in phase to each other,

an output of said first current mirror circuit is supplied to a biased side of a third current mirror circuit, while an output of said second current mirror circuit is supplied to an output side of said third current mirror circuit,

an output of said second current mirror circuit is supplied to a biased side of a fourth current mirror circuit, while an output of said first current mirror circuit is supplied to an output side of said fourth current mirror circuit,

a first connecting point of said first and fourth current mirror circuits being connected to a base of a first transistor which is emitter-follower-connected, a second connecting point of said second and third current mirror circuits being connected to a base of a second transistor which is emitter-follower-connected, said first and second connecting points being connected to a current source circuit, and said first and second transistors having emitters connected together, thereby to provide a full-wave-rectified output.