Instead of simply grounding the LT6202 noninverting input, an LTC2050 drives it (and therefore the source) exactly to where it needs to be for zero JFET gate voltage. Output offset is 200mV and output noise is 2mVP-P measured in a 20MHz bandwidth.
Source: http://www.hqew.net/circuit-diagram/Low-Noise$2c-Low-Power-Photodiode-Amplifier-With-DC-Precision_7917.html
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