Datenblatt-Suchmaschine für elektronische Bauteile |
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MC2007-3 Datenblatt(PDF) 10 Page - M/A-COM Technology Solutions, Inc. |
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MC2007-3 Datenblatt(HTML) 10 Page - M/A-COM Technology Solutions, Inc. |
10 / 18 page Functional Description 02007-DSH-002-E Mindspeed Technologies ® 8 Mindspeed Proprietary and Confidential 3.3 General Description 3.3.1 TIA The transimpedance amplifier consists of a high gain single-ended CMOS amplifier (TIA), with a feedback resistor. The feedback creates a low impedance at the input and virtually all of the input current passes through the feedback resistor, defining the voltage at the output. Advanced CMOS design techniques are employed to maintain the stability of this stage across all input conditions. Single-ended amplifiers have inherently poor power supply noise rejection. For this reason, an on-chip, low dropout, linear regulator has been incorporated into the design to give excellent noise rejection up to several MHz. Higher frequency power supply noise must be removed by external decoupling. The circuit is designed for PIN photodiodes in the grounded cathode configuration, with the anode connected to the input of the TIA and the cathode connected to the PIN K input. The PIN K pad supplies ~1.7V to reverse bias the pin diode to reduce capacitance. If a higher reverse voltage is required, the user may supply their own low impedance bias supply. 3.3.2 AGC The MC2007-3 has been designed to operate over the input range of +3 dBm to –39 dBm at long wavelengths. To do so, the AGC achieves a dynamic range compression of 50:1 in transimpedance. The AGC only operates on signals greater than –30 dBm (@ 0.9 A/W). This knee in the gain response is important when setting signal detect functions in the following post amplifier. It also aids in active photodiode alignment. 3.3.3 Output Stage The signal from the TIA enters a phase splitter and a pair of voltage follower outputs. These are designed to drive a high impedance (>500 Ω) load. They are stable for driving capacitive loads, such as interstage filters. |
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Ähnliche Beschreibung - MC2007-3 |
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