Bias circuit
AssigneeNXP B.V.
InventorJean-Jacques Bouny
Life of this patent
Estimating the term…
Abstract
Proposed is a bias circuit for a transistor in a C class amplifier. The bias circuit comprises: a class AB amplifier bias voltage generating means adapted to generate a bias voltage at an output terminal; and a transistor connected between the output terminal and a first reference voltage, the control terminal of the transistor being connected to a second reference voltage via a switch. Closure of the switch connects the second reference voltage to the control terminal of the transistor to cause a shift in the bias voltage generated by the class AB amplifier bias voltage generating means to achieve a predetermined class C bias voltage at the output terminal.
Claims13
A bias circuit for a transistor in a C class amplifier, the bias circuit comprising:
- a class AB amplifier bias voltage generating means adapted to generate a bias voltage at an output terminal;
- and
- a transistor connected between the output terminal and a first reference voltage, the control terminal of the transistor being connected to a second reference voltage via a switch,
- wherein closure of the switch connects the second reference voltage to the control terminal of the transistor to cause a shift in the bias voltage generated by the class AB amplifier bias voltage generating means to achieve a predetermined class C bias voltage at the output terminal.
A method of biasing a transistor in a C class amplifier, using a bias circuit comprising:
- a class AB amplifier bias voltage generating means;
- and a transistor connected between the output terminal and a first reference voltage, the control terminal of the transistor being connected to a second reference voltage via a switch, the method comprising the steps of:
- generating a bias voltage at an output terminal of the bias circuit using the class AB amplifier bias voltage generating means;
- and
- activating the switch to connect the second reference voltage to the control terminal of the transistor so as to cause a shift in the bias voltage generated by the class AB amplifier bias voltage generating means to achieve a predetermined class C bias voltage at the output terminal.
(canceled)
Dependencies are inferred from the claim text.