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OPA656: The value selection of CD of OPA656

Part Number: OPA656
Other Parts Discussed in Thread: LMH6559, , BUF602

Hi how to choose the value of CD in the real circuit as the following

The data sheet says that CD indicates the diode capacitance. Then, which capacitors are diode capacitors in the following circuit, or how to select the value of CD in the following circuit?

Thanks very much

Fig.1 Circuit connection flow chart.     function generator—SPDT—LMH6559—Capacitance and resistance-OPA656

Fig.2 OPA656 circuit design schematic

Fig.3 OPA656 data sheet ,Wideband, High-Sensitivity, Transimpedance Amplifier