Apparatus and method for a nested transimpedance amplifier
AssigneeMarvell International Ltd.
InventorSehat Sutardja
Life of this patent
Estimating the term…
Abstract
A nested transimpedance amplifier (TIA) circuit includes a zero-order TIA having an input and an output. A first operational amplifier (opamp) has an input that communicates with the output of the zero-order TIA and an output. A first feedback resistor has one end that communicates with the input of the zero-order TIA and an opposite end that communicates with the output of the first opamp. A capacitor has one end that communicates with the input of the zero-order TIA. The gain-bandwidth product of the nested TIA is increased. Differential mode TIAs also have increased gain-bandwidth products.
Claims15
A nested transimpedance amplifier (TIA) circuit, comprising:
- a zero-order TIA having an input and an output;
- a first operational amplifier (opamp) having an input that communicates with said output of said zero-order TIA and an output;
- and
- a first feedback resistance having one end that communicates with said input of said zero-order TIA and an opposite end that communicates with said output of said first opamp,
- wherein said zero order TIA comprises:
- a second opamp having an input and an output,
- a third opamp having an input that communicates with said output of said second opamp and an output;
- and
- a second feedback resistance having one end that communicates with said input of said third opamp and an opposite end that communicates with said output of said third opamp.
A nested differential mode TIA circuit, comprising:
- a zero-order differential mode TIA having first and second inputs and first and second outputs;
- a first differential mode opamp having first and second inputs that communicate with said first and second outputs of said zero-order differential mode TIA and first and second outputs;
- a first feedback resistance having one end that communicates with said first input of said zero-order differential mode TIA and an opposite end that communicates with said first output of said zero-order first differential mode TIA opamp;
- and
- a second feedback resistance having one end that communicates with said second input of said zero-order differential mode TIA and an opposite end that communicates with said second output of said zero-order first differential mode TIA opamp,
- wherein said zero order differential mode TIA includes:
- a second differential mode opamp having first and second inputs and first and second outputs;
- a third differential mode opamp having first and second inputs that communicates with said first and second outputs of said second differential mode opamp and first and second outputs;
- a third feedback resistance having one end that communicates with said first input of said third differential mode opamp and an opposite end that communicates with said first output of said third differential mode opamp;
- and
- a fourth feedback resistance having one end that communicates with said second input of said third differential mode opamp and an opposite end that communicates with said second output of said third differential mode opamp.
Dependencies are inferred from the claim text.