Radio frequency switch with improved intermodulation distortion through use of feed forward capacitor
First Claim
Patent Images
1. A radio frequency switch comprising:
- a field effect transistor (FET) having a drain terminal, a source terminal, and a gate terminal;
a resistor element network connected to the gate terminal, the resistor element network comprising at least two resistors including a gate resistor;
a control voltage source providing a DC bias voltage to the gate terminal for operation of the FET through the resistor element network;
a voltage divider electrically connected between the drain terminal and the source terminal; and
a dedicated feed forward capacitor electrically connected between the resistor element network connected to the gate terminal and the voltage divider, wherein the dedicated feed forward capacitor feeds a modified RF voltage from the drain terminal and the source terminal to the gate terminal through the gate resistor element network without affecting the DC bias voltage applied thereto.
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Abstract
A radio frequency (RF) switch using a field effect transistor has 2nd order intermodulation distortion improved through use of a feed forward capacitor electrically connected between the gate and a voltage coupler connected between the source and drain of the FET. With a control voltage provided at the gate through a gate feed resistor for operation of the FET, the feed forward capacitor feeds an RF voltage from the drain terminal and the source terminal to the gate terminal through the gate feed resistor.
48 Citations
20 Claims
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1. A radio frequency switch comprising:
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a field effect transistor (FET) having a drain terminal, a source terminal, and a gate terminal; a resistor element network connected to the gate terminal, the resistor element network comprising at least two resistors including a gate resistor; a control voltage source providing a DC bias voltage to the gate terminal for operation of the FET through the resistor element network; a voltage divider electrically connected between the drain terminal and the source terminal; and a dedicated feed forward capacitor electrically connected between the resistor element network connected to the gate terminal and the voltage divider, wherein the dedicated feed forward capacitor feeds a modified RF voltage from the drain terminal and the source terminal to the gate terminal through the gate resistor element network without affecting the DC bias voltage applied thereto. - View Dependent Claims (2, 3, 4, 5)
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6. A radio frequency (RF) switch comprising:
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a field effect transistor (FET) having a drain terminal, a source terminal, and a gate terminal; and a gate resistor connected to the gate terminal; a dedicated feed forward capacitor electrically connected between the gate resistor and an electrical coupling of the drain and source terminals of the FET, wherein the dedicated feed forward capacitor feeds a modified RF voltage from the drain terminal and the source terminal to the gate terminal through the gate resistor without affecting a DC bias voltage applied thereto. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A radio frequency (RF) switch comprising:
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a plurality of field effect transistors (FETs), each having a drain terminal, a source terminal, and a gate terminal; and a gate resistor connected to each gate terminal; a dedicated feed forward capacitor electrically connected between the gate resistor of each of the plurality of FETs and an electrical coupling of the drain and source terminals for each of the plurality of FETs, wherein the dedicated feed forward capacitor feeds a modified RF voltage from at least one of the drain terminal and the source terminal of each of the plurality of FETs to the gate terminal through the gate resistor without affecting a DC bias voltage applied thereto. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A radio frequency (RF) switch comprising:
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a field effect transistor (FET) having a drain terminal, a source terminal, and a gate terminal; a gate resistor connected to the gate terminal; and a dedicated feed forward capacitor electrically connected between the gate resistor and at least one of the drain and source terminals, wherein the dedicated feed forward capacitor feeds a modified RF voltage from the at least one of the drain terminal and the source terminal to the gate terminal through the gate resistor without affecting a DC bias voltage applied thereto. - View Dependent Claims (20)
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Specification