Switching circuit at high frequency with low insertion loss
First Claim
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1. A switching circuit comprising:
- first, second and third input/output terminals,a first field-effect transistor having drain and source terminals connected to said first and second input/output terminals respectively,a second field-effect transistor having drain and source terminals connected to said first and third input/output terminals respectively, andfirst and second impedance elements connected to gate terminals of said first and second field-effect transistors respectively; and
first and second inductors connecting said first and second input/output terminals to each other and said first and third input/output terminals to each other respectively; and
a third, fourth and fifth impedance elements connected between a bias voltage source and said first, second and third input/output terminals respectively.
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Abstract
In a switching circuit, low insertion loss and enough isolation can be ensured at a desired frequency at the same time. An inductor is externally connected in parallel with the path between the drain and source of each of field-effect transistors built in a switching integrated circuit, and the inductor and the OFF capacitance of the field-effect transistor are made to generate parallel resonance. At this time, by suitably adjusting the inductance, low insertion loss and enough isolation are ensured at a desired frequency at the same time.
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6 Claims
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1. A switching circuit comprising:
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first, second and third input/output terminals, a first field-effect transistor having drain and source terminals connected to said first and second input/output terminals respectively, a second field-effect transistor having drain and source terminals connected to said first and third input/output terminals respectively, and first and second impedance elements connected to gate terminals of said first and second field-effect transistors respectively; and first and second inductors connecting said first and second input/output terminals to each other and said first and third input/output terminals to each other respectively; and a third, fourth and fifth impedance elements connected between a bias voltage source and said first, second and third input/output terminals respectively. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification