Bias circuit for a high power radio frequency switching device
First Claim
1. A circuit comprising:
- a first transistor having a first gate terminal and configured to facilitate switching of a radio frequency (RF) signal;
a second transistor having a second gate terminal configured to receive a constant bias voltage;
a gate resistor coupled between the first gate terminal and a control terminal;
a plurality of diodes, wherein the second transistor and the plurality of diodes are coupled in series between the first gate terminal and the control terminal; and
a gate circuit coupled with the second gate terminal and configured to generate the constant bias voltage based on a first control voltage, and a second control voltage that is complementary to the first control voltage.
2 Assignments
0 Petitions
Accused Products
Abstract
Embodiments provide a switching circuit including a transistor and a bias circuit. The transistor may transition between an off state and an on state responsive to a control signal received at a control terminal. The bias circuit may be coupled between the control terminal and a gate terminal of the transistor. The bias circuit may include a gate resistor coupled between the gate terminal and the control terminal. The bias circuit may further include one or more diodes coupled in parallel with the gate resistor between the gate terminal and the control terminal to allow leakage current to pass from the gate terminal through the one or more diodes. In some embodiments, the bias circuit may include a switch coupled with the one or more diodes to selectively couple the one or more diodes in parallel with the gate resistor when the transistor is off.
12 Citations
17 Claims
-
1. A circuit comprising:
-
a first transistor having a first gate terminal and configured to facilitate switching of a radio frequency (RF) signal; a second transistor having a second gate terminal configured to receive a constant bias voltage; a gate resistor coupled between the first gate terminal and a control terminal; a plurality of diodes, wherein the second transistor and the plurality of diodes are coupled in series between the first gate terminal and the control terminal; and a gate circuit coupled with the second gate terminal and configured to generate the constant bias voltage based on a first control voltage, and a second control voltage that is complementary to the first control voltage. - View Dependent Claims (2, 3, 4)
-
-
5. A radio frequency (RF) switching apparatus comprising:
-
a transistor having a gate terminal; a control terminal coupled with the gate terminal, the control terminal to receive a first control voltage to turn the transistor on or off to facilitate switching of an RF signal; and a bias circuit coupled between the gate terminal and the control terminal, the bias circuit including a gate resistor coupled between the gate terminal and the control terminal; the bias circuit to selectively provide a conductive path between the gate terminal and the control terminal, around the gate resistor and through one or more diodes, when the transistor is off; and the bias circuit configured to receive a constant bias voltage based on the first control voltage and a second control voltage that is complementary to the first control voltage. - View Dependent Claims (6, 7, 8, 9, 10, 11)
-
-
12. A system comprising:
-
an input port to receive a radio frequency (RF) signal; an output port; a series transistor coupled in series between the input port and the output port to selectively pass the RF signal to the output port when the series transistor is on; a series control terminal coupled with a gate terminal of the series transistor, the series control terminal to receive a series control voltage to turn the series transistor on or off; a series bias circuit coupled with the gate terminal of the series transistor, the series bias circuit including; a series gate resistor coupled between the gate terminal of the series transistor and the series control terminal; one or more diodes coupled in parallel with the series gate resistor between the gate terminal of the series transistor and the series control terminal; and a series switch coupled in series with the one or more diodes between the gate terminal of the series transistor and the series control terminal to selectively conductively couple the one or more diodes in parallel with the series gate resistor responsive to the series control voltage; a shunt transistor coupled in shunt with a transmission path between the input port and the output port; a shunt control terminal coupled with a gate terminal of the shunt transistor, the shunt control terminal to receive a shunt control voltage to turn the shunt transistor on or off, the shunt control voltage being complementary to the series control voltage; a shunt bias circuit comprising a shunt switch; and a plurality of individual gate circuits coupled to the series switch and the shunt switch, such that each of the plurality of individual gate circuits is configured to pass a constant bias voltage to the series switch and the shunt switch, wherein the constant bias voltage has a value equal to the lesser of a value of the series control voltage and a value of the shunt control voltage. - View Dependent Claims (13, 14, 15, 16, 17)
-
Specification