Push-pull wideband semiconductor amplifier
First Claim
1. A semiconductor circuit comprising:
- a divider which divides an input signal into two signals of differing phase;
first and second amplifying circuits which respectively amplify the signals divided by said divider;
a combiner which combines the two signals amplified by said first and second amplifying circuits and outputs a result signal;
an imaginary ground point which is a node between said first amplifying circuit and said second amplifying circuit having an AC potential essentially of 0 V; and
a termination circuit provided between said imaginary ground point and ground that absorbs fluctuation in said AC potential generated at said imaginary ground point.
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Accused Products
Abstract
A push-pull wideband semiconductor amplifier for use in, for example, a CATV (cable television) system. The amplifier suppresses deterioration of composite second-order (CSO) distortion in output signals. The push-pull wideband amplifier includes: a divider which divides a signal inputted by way of an input terminal into two signals of differing phase, first and second amplifying circuits each of which amplifies the signal divided by the divider, and a combiner which combines the two signals amplified by the first and second amplifying circuits into one signal and outputs the result signal. The node between the first amplifying circuit and the second amplifying circuit is an imaginary ground point having a potential of 0 V from the standpoint of an alternating-current signal. A termination circuit is provided between this imaginary ground, point and ground and absorbs fluctuation in potential generated at the imaginary ground point. In the event of fluctuation in potential generated at the imaginary ground point, the fluctuation in potential is absorbed by the termination circuit. The standing wave that accompanies fluctuation in potential is therefore not generated, and even-order distortion is suppressed.
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Citations
11 Claims
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1. A semiconductor circuit comprising:
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a divider which divides an input signal into two signals of differing phase; first and second amplifying circuits which respectively amplify the signals divided by said divider; a combiner which combines the two signals amplified by said first and second amplifying circuits and outputs a result signal; an imaginary ground point which is a node between said first amplifying circuit and said second amplifying circuit having an AC potential essentially of 0 V; and a termination circuit provided between said imaginary ground point and ground that absorbs fluctuation in said AC potential generated at said imaginary ground point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification