Voltage controlling circuit
AssigneePrinceton Technology Corporation
InventorsYung-Ming Lee, Tzu-Fei Han
Life of this patent
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Abstract
A voltage clamping module is disposed at an output terminal of a gain amplifying module, so that a voltage level of an amplifying signal outputted by the gain amplifying module can be clamped within a predetermined range. The voltage clamping module includes an upper bound voltage clamping module, which is utilized for limiting the voltage level of the amplifying signal to be lower than an upper bound voltage level, and a lower bound voltage clamping module, which is utilized for limiting the voltage level of the amplifying signal to be higher than a lower bound voltage level.
Claims12
A voltage controlling circuit, comprising:
- a gain amplifying module for generating an amplifying signal according to an input signal;
- a voltage clamping module coupled to the gain amplifying module for clamping a voltage level of the amplifying signal within a predetermined range so as to generate a voltage clamping signal;
- and
- a gain controlling module coupled to the voltage clamping module for generating an output signal according to a selection signal and the voltage clamping signal;
- wherein the voltage clamping module comprises:
- a capacitor having a first terminal coupled to the gain amplifying module for receiving the amplifying signal;
- and
- an upper bound voltage clamping module having a terminal coupled to a second terminal of the capacitor for limiting the voltage level of the amplifying signal within an upper bound voltage level, wherein the upper bound voltage clamping module comprises a P-type metal-oxide semiconductor field effect transistor (MOSFET) having a gate coupled to a voltage source and having a source coupled to the second terminal of the capacitor, wherein the voltage source is configured to provide the upper bound voltage level.
Dependencies are inferred from the claim text.