发明授权
- 专利标题: Transimpedance amplifier having a shared input
- 专利标题(中): 具有共享输入的互阻放大器
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申请号: US12496514申请日: 2009-07-01
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公开(公告)号: US08204388B2公开(公告)日: 2012-06-19
- 发明人: Radhakrishnan L. Nagarajan , Huan-Shang Tsai
- 申请人: Radhakrishnan L. Nagarajan , Huan-Shang Tsai
- 申请人地址: US CA Sunnyvale
- 专利权人: Infinera Corporation
- 当前专利权人: Infinera Corporation
- 当前专利权人地址: US CA Sunnyvale
- 代理商 David L. Soltz
- 主分类号: H04B10/06
- IPC分类号: H04B10/06
摘要:
Consistent the present disclosure, a receive circuit is provided that includes a balanced detector portion and a transimpedance amplifier (TIA). The anode of one photodiode is connected to the cathode of the other by a bonding pad, which supplies the sum of the currents generated in each photodiode to an input of the TIA. Thus, the TIA may, for example, have a single input, as opposed to multiple inputs, thereby reducing the number of connections so that the photodiodes and the TIA may be integrated onto a smaller die. In addition, since there are few connections, fewer TIAs are required and differential stages are unnecessary. Power consumption is thus reduced, and, since the photodiode current is fed through one input to the TIA, fewer feedback resistors are required, thereby reducing thermal noise. In addition, since the anode of one photodiode is connected to the cathode of the other, the dark current generated in each flows in opposite directions, and is therefore effectively cancelled out. Since one input is provided, impedance matching with other inputs is unnecessary, nor is additional DC biasing circuitry needed. As described in greater detail below, an example of the present disclosure includes a bonding pad, which connects the two photodiodes and provides the input current to the TIA.
公开/授权文献
- US20110001204A1 TRANSIMPEDANCE AMPLIFIER HAVING A SHARED INPUT 公开/授权日:2011-01-06
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