Multi-mode bias circuit for power amplifiers
First Claim
1. A circuit arrangement comprising:
- a multi-mode bias circuit comprising a control voltage input, a mode control input for selecting between a linear mode and a saturation mode, and a bias output;
an amplifier comprising a bias input connected to said bias output of said multi-mode bias circuit, said amplifier further comprising an RF input and an RF output;
said multi-mode bias circuit causing an RF output power at said RF output to be proportional to an RF input power at said RF input when said mode control input selects said linear mode;
said multi-mode bias circuit causing an RF output power at said RF output to be determined by said control voltage input when said mode control input selects said saturation mode.
1 Assignment
0 Petitions
Accused Products
Abstract
According to an exemplary embodiment, a circuit arrangement includes a multi-mode bias circuit having a control voltage input, a mode control input for selecting between a linear mode and a saturation mode, and a bias output. The circuit arrangement further includes an amplifier having a bias input connected to the bias output of the multi-mode bias circuit, the amplifier having an RF input and an RF output. The multi-mode bias circuit causes the amplifier RF output power to be proportional to the RF input power when the mode control input selects the linear mode. Conversely, the multi-mode bias circuit causes the amplifier RF output power to be determined by the voltage at the control voltage input when the mode control input selects the saturation mode.
-
Citations
20 Claims
-
1. A circuit arrangement comprising:
-
a multi-mode bias circuit comprising a control voltage input, a mode control input for selecting between a linear mode and a saturation mode, and a bias output;
an amplifier comprising a bias input connected to said bias output of said multi-mode bias circuit, said amplifier further comprising an RF input and an RF output;
said multi-mode bias circuit causing an RF output power at said RF output to be proportional to an RF input power at said RF input when said mode control input selects said linear mode;
said multi-mode bias circuit causing an RF output power at said RF output to be determined by said control voltage input when said mode control input selects said saturation mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A circuit comprising:
-
a biasing means for causing an amplifier to operate in a linear mode or a saturation mode;
said biasing means comprising a controlled current source, said controlled current source being enabled in said linear mode and being disabled in said saturation mode;
said biasing means further comprising a switch coupled to a control voltage input, said switch being closed in said saturation mode and being open in said linear mode. - View Dependent Claims (12, 13, 14, 15)
-
-
16. A circuit comprising:
-
a biasing means for causing an amplifier to operate in a linear mode or a saturation mode;
said biasing means comprising a controlled current source, said controlled current source coupled to a gate of a transistor, said controlled current source being enabled in said linear mode;
said biasing means further comprising a control voltage input, said control voltage input coupled to said gate of said transistor in said saturation mode;
wherein a source of said transistor is a bias output of said biasing means. - View Dependent Claims (17, 18, 19, 20)
-
Specification