High-frequency signal processing device
AssigneeRenesas Electronics Corporation
InventorTomoumi Yagasaki
Life of this patent
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Abstract
Disclosed is a high-frequency signal processing device capable of reducing transmission power variation and harmonic distortion. For example, the high-frequency signal processing device includes a pre-driver circuit, which operates within a saturation region, and a final stage driver circuit, which operates within a linear region and performs a linear amplification operation by using an inductor having a high Q-value. The pre-driver circuit suppresses the amplitude level variation of a signal directly modulated, for instance, by a voltage-controlled oscillator circuit. Harmonic distortion components (2HD and 3HD), which may be generated by the pre-driver circuit, are reduced, for instance, by the inductor of the final stage driver circuit.
Claims5
A high-frequency signal processing device comprising:
- a first amplifier circuit which operates in a saturation region where output power is higher than at a 1 dB gain compression point, receives a first input signal, which is phase-modulated or frequency-modulated, and amplifies power by using a first inductor as a load;
- a second amplifier circuit which operates in a linear region where output power is lower than at the 1 dB gain compression point, receives a second input signal, which is output from the first amplifier circuit, and amplifies power by using a second inductor as a load, the second inductor having a higher Q-value than the first inductor;
- an LC resonant oscillator circuit,
- wherein the first input signal is generated when an LC component of the LC resonant oscillator circuit is modulated in accordance with transmission data;
- a mixer circuit that downconverts a third input signal by using a local oscillation signal;
- and
- a buffer circuit that is disposed downstream of the LC resonant oscillator circuit,
- wherein the LC resonant oscillator circuit outputs the first input signal to the first amplifier circuit through the buffer circuit at the time of transmission, and outputs the local oscillation signal to the mixer circuit through the buffer circuit at the time of reception.
A high-frequency signal processing device comprising:
- a first amplifier circuit which operates in a saturation region where output power is higher than at a 1 dB gain compression point, receives a first input signal, which is phase-modulated or frequency-modulated, and amplifies power by using a first inductor as a load;
- a second amplifier circuit which operates in a linear region where output power is lower than at the 1 dB gain compression point, receives a second input signal, which is output from the first amplifier circuit, and amplifies power by using a second inductor as a load, the second inductor having a higher Q-value than the first inductor;
- and
- an LC resonant oscillator circuit,
- wherein the first input signal is generated when an LC component of the LC resonant oscillator circuit is modulated in accordance with transmission data, and
- wherein the first and second amplifier circuits have a differential configuration.
Dependencies are inferred from the claim text.