Radio receiving circuit
AssigneeKabushiki Kaisha Toshiba
InventorGaku Takemura
Life of this patent
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Abstract
According to one embodiment, a radio receiving circuit includes a low-noise amplifier, a frequency conversion circuit, a capacitor interposed between the low-noise amplifier and the frequency conversion circuit, and an operational amplifier that includes a feedback resistor and amplifies a baseband signal. The gains in the frequency conversion circuit and the operational amplifier are kept constant irrespective of the level of a local oscillation frequency input to the frequency conversion circuit.
Claims14
A radio receiving circuit comprising:
- a first amplifier that amplifies a received radio frequency signal;
- a frequency conversion circuit that multiplies together a signal from the first amplifier and a local oscillation signal and converts the multiplied signal into a baseband signal;
- a capacitor interposed between the first amplifier and the frequency conversion circuit;
- and
- a second amplifier that includes a resistor and amplifies the baseband signal, wherein
- gains in the frequency conversion circuit and the second amplifier are kept constant irrespective of a level of a local oscillation frequency input to the frequency conversion circuit.
The radio receiving circuit according to claim 5, further comprising a control unit that controls the capacitor such that the capacitance decreases as the local oscillation frequency rises.
A radio receiving circuit comprising:
- a first amplifier that amplifies a received radio frequency signal;
- a frequency conversion circuit that multiplies together a signal from the first amplifier and a local oscillation signal and converts the multiplied signal into a baseband signal;
- a capacitor interposed between the first amplifier and the frequency conversion circuit;
- and
- a second amplifier that includes a resistor and amplifies the baseband signal;
- and
- a resistor interposed between the frequency conversion circuit and the second amplifier and configured to be capable of changing resistance, wherein
- gains in the frequency conversion circuit and the second amplifier are kept constant irrespective of a level of a local oscillation frequency input to the frequency conversion circuit.
A radio receiving circuit comprising:
- a first amplifier that amplifies a received radio frequency signal;
- a frequency conversion circuit that multiplies together a signal from the first amplifier and a local oscillation signal and converts the multiplied signal into a baseband signal;
- a first capacitor interposed between the first amplifier and the frequency conversion circuit;
- and
- a second amplifier that includes a resistor and a second capacitor and amplifies the baseband signal, wherein
- gains in the frequency conversion circuit and the second amplifier are kept constant irrespective of a level of a local oscillation frequency input to the frequency conversion circuit.
Dependencies are inferred from the claim text.