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US 2013/0293301 A1Published application
Trans-impedance amplifier for high speed optical-electrical interfaces
AssigneeSTMicroelectronics S.r.l.
InventorsWissam Yussef Sabri EYSSA, Enrico Stefano TEMPORITI MILANI, Daniele BALDI
Life of this patent
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Abstract
A differential or pseudo-differential TIA includes an auxiliary differential amplifier input transistor pair cross-coupled to the output nodes to cancel undesired output signal components. The advantages of a classical differential topology are retained while performance at a high data rate is significantly improved.
Claims26
1-4. (canceled)
A differential trans-impedance amplifier circuit comprising:
- a positive voltage bias node and a negative voltage bias node;
- a photodiode comprising an anode and a cathode;
- a pair of identical series impedances, each coupling said anode to said negative voltage bias node and coupling said cathode to said positive voltage bias node respectively;
- a pair of load impedances;
- a pair of output nodes;
- a first differential input transistor pair, comprising a first pair of input nodes coupled to said anode and cathode respectively, and coupled to said pair of load impedances to generate on said pair of output nodes a first amplified replica of a differential voltage on said first pair of input nodes;
- and
- a second differential input transistor pair identical to and sharing said pair of load impedances with said first differential input transistor pair, comprising a second pair of input nodes, and configured to generate on said pair of output nodes a second amplified replica of the differential voltage on said second pair of input nodes in phase opposition to the first amplified replica of the differential voltage on said first pair of input nodes;
- a pair of blocking capacitors coupling said second pair of input nodes to said positive voltage bias node and said negative voltage bias node respectively.
6 more elements
A differential trans-impedance amplifier for a photodiode, comprising:
- a positive voltage bias node and a negative voltage bias node;
- a pair of series impedances configured to couple the photodiode to said negative voltage bias node and said positive voltage bias node respectively;
- a pair of load impedances;
- a pair of output nodes;
- a first differential input transistor pair coupled to said pair of load impedances and configured to generate on said pair of output nodes a first amplified replica of a differential voltage on the photodiode;
- and
- a second differential input transistor pair sharing said pair of load impedances with said first differential input transistor pair and configured to generate on said pair of output nodes a second amplified replica of the differential voltage in phase opposition to the first amplified replica.
4 more elements
A trans-impedance amplification method for a photodiode, comprising:
- operating a first differential input transistor pair coupled to a pair of load impedances to generate on a pair of output nodes a first amplified replica of a differential voltage on the photodiode;
- and
- operating a second differential input transistor pair sharing the pair of load impedances with the first differential input transistor pair to generate on the pair of output nodes a second amplified replica of the differential voltage in phase opposition to the first amplified replica.
Dependencies are inferred from the claim text.