Transimpedance circuits and methods
AssigneeAnalog Devices International Unlimited Company
InventorsJinhua Ni, Wei Wang, Hui Shen
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Abstract
Disclosed herein are transimpedance circuits, as well as related methods and devices. In some embodiments, a transimpedance circuit may include a current source bias terminal, a current source output terminal, and a transimpedance amplifier coupled to the current source output terminal, wherein voltage signals at the current source bias terminal are correlated with voltage signals at the current source output terminal. In some embodiments, the current source may be a photodiode.
Claims20
A transimpedance circuit, comprising:
- a current source bias terminal;
- a current source output terminal;
- a transimpedance amplifier coupled to the current source output terminal;
- and
- a voltage divider having first and second voltage terminals, wherein the first voltage terminal of the voltage divider is coupled to the current source bias terminal, and the second voltage terminal of the voltage divider is coupled to a reference voltage terminal of the transimpedance amplifier,
- wherein voltage signals at the current source bias terminal are correlated with voltage signals at the current source output terminal.
A photometric system, comprising:
- photodiode receiver circuitry, wherein the photodiode receiver circuitry includes a first photodiode terminal, a second photodiode terminal, and a transimpedance amplifier to generate a voltage from a current between the first photodiode terminal and the second photodiode terminal, and wherein voltages at the first photodiode terminal and the second photodiode terminal are correlated;
- and
- a voltage divider having first and second voltage terminals, wherein the first voltage terminal of the voltage divider is coupled to the first photodiode terminal, and the second voltage terminal of the voltage divider is coupled to a reference voltage terminal of the transimpedance amplifier.
A method of operating a photodiode circuit, comprising:
- providing a bias voltage to a photodiode terminal;
- providing a common-mode voltage to a transimpedance amplifier, wherein the bias voltage and the common-mode voltage are correlated;
- and
- providing a voltage divider having first and second voltage terminals, wherein the first voltage terminal of the voltage divider is coupled to the photodiode terminal to provide the bias voltage, and the second voltage terminal of the voltage divider is coupled to a common-mode voltage terminal of the transimpedance amplifier to provide the common-mode voltage.
Dependencies are inferred from the claim text.