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US 2014/0191804 A1Published application
Variable gain amplifier
AssigneePanasonic Corporation
InventorRyo Kitamura
Life of this patent
Estimating the term…
Abstract
A variable gain amplifier (100) includes a transistor (110), an FB impedance section (120), a source impedance section (130), a drain impedance section (140), a gain controller (150), and a frequency characteristic controller (160). The gain controller (150) varies impedance of one of the FB impedance section (140), the source impedance section (130), and the drain impedance section (140), and outputs a gain control signal. The frequency characteristic controller (160) varies the impedance of different impedance section, based on the gain control signal.
Claims12
1-11. (canceled)
A variable gain amplifier comprising:
- an amplifying element including a control terminal to which an input signal is input, a reference-side terminal connected to reference electric-potential, and a power-supply-side terminal connected to a direct-current power supply, the amplifying element configured to amplify the input signal;
- an FB impedance section connected between the control terminal and the power-supply-side terminal;
- a reference-side impedance section connected to the reference-side terminal;
- a power-supply-side impedance section connected to the power-supply-side terminal;
- a gain controller configured to control a gain of the amplifying element;
- and
- a frequency characteristic controller configured to control a frequency characteristic of the gain, wherein
- the gain controller varies an impedance of one impedance section of the FB impedance section, the reference-side impedance section, and the power-supply-side impedance section, and outputs a control signal for controlling the gain, and
- the frequency characteristic controller varies an impedance of an impedance section differing from the one impedance section, based on the control signal for controlling the gain.
6 more elements
Dependencies are inferred from the claim text.