Abstract
Regulated cascode (RGC) techniques are applied to achieve better isolation of the large input parasitic capacitance in a front-end preamplifier for optical receiver applications, since the RGC circuit behaves like a common-gate transistor with large transconductance comparable to GaAs MESFET. The input resistance of the RGC circuit becomes smaller by the amount of the voltage-gain of the local feedback stage than that of a conventional common-gate input stage. Hence the RGC circuit gives a virtual-ground input impedance and better isolates the input parasitics. With this very low input impedance characteristic, a RGC transimpedance amplifier is realized with a 0.6μm digital CMOS process. This amplifier is packaged in a MQFP package, mounted on a copper PC-board, and housed in an aluminum metal box. The measured results demonstrate 300MHz bandwidth, 57.7dB Ω transimpedance gain, 10 pA/√Hz average noise current spectral density with ±6V power supply.
Original language | English |
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Article number | 1471302 |
Pages (from-to) | 431-434 |
Number of pages | 4 |
Journal | European Solid-State Circuits Conference |
State | Published - 2000 |
Event | 26th European Solid-State Circuits Conference, ESSCIRC 2000 - Stockholm, Sweden Duration: 19 Sep 2000 → 21 Sep 2000 |