Variable gain amplifier device
AssigneeKabushiki Kaisha Toshiba
InventorsShoji Otaka, Takafumi Yamaji
Life of this patent
Estimating the term…
Abstract
A variable gain amplifier device controlled by a first gain control signal comprises a gain controlled amplifier having a gain and including a differential pair of first and second MOS type transistors configured to operate in a weak inversion region; and a control signal converter configured to convert the first gain control signal into a second gain control signal, and supply the second gain control signal to the gain controlled amplifier to exponentially vary the gain with respect to the first gain control signal.
Claims21
A variable gain amplifier device controlled by a first gain control signal, comprising:
- a gain controlled amplifier having a gain and including a differential pair of first and second MOS type transistors configured to operate in a weak inversion region;
- and
- a control signal converter configured to convert the first gain control signal into a second gain control signal, and supply the second gain control signal to the gain controlled amplifier to exponentially vary the gain with respect to the first gain control signal.
A variable gain amplifier device controlled by a first gain control signal, comprising:
- a gain controlled amplifier having a gain and including a first differential pair of first and second MOS type transistors configured to operate in a weak inversion region, and a second differential pair of seventh and eighth MOS type transistors configured to operate in a weak inversion region;
- and
- a control signal converter configured to convert the first gain control signal into a second gain control signal, and supply the second gain control signal to the gain controlled amplifier to exponentially vary the gain with respect to the first gain control signal.
Dependencies are inferred from the claim text.