The circuit accepts a single-ended input and converts it to a differential signal using a wide bandwidth (3 GHz) M/A-COM ECT1- 1-13M 1:1 transformer. The differential input impedance of the 5 GHz ADA4960-1 differential amplifier is 10 kΩ. The gain can be adjusted from 0 dB to 18 dB by selecting the external gain setting resistor RG. The differential output impedance is 150 Ω.
The ADA4960-1 is the ideal driver for the AD9434, which provides a fully differential architecture in the ADC through a low-pass filter, providing good high-frequency common-mode rejection while minimizing second-order distortion products. The ADA4960-1 provides a gain of 0 dB to 18 dB based on an external gain resistor. In this circuit, the insertion loss of the 3.4 dB gain-compensating filter network (1.1 dB) and the transformer (0.1 dB) is used to provide a total signal gain of 2.3 dB. An input signal of approximately 5.4 dBm produces a full-scale 1.5 V pp differential signal at the ADC input.
The anti-aliasing filter is a third-order Butterworth filter designed using a standard filter design procedure. The Butterworth filter was chosen because it has a flat response in the passband. The third-order filter produces an AC noise-to-noise ratio of 1.05 and can be designed with a variety of free filter programs. For best performance, the ADA4960-1 should be loaded with a 100 Ω net differential load. A 5 Ω series resistor isolates the filter capacitor from the amplifier output. The 62 Ω resistor is in parallel with the downstream impedance and produces a net load impedance of 101 Ω when a 10 Ω series resistor is added.
A 5 Ω resistor in series with the ADC input isolates the internal switching transients from the filter and amplifier. A 511 Ω resistor in parallel with the ADC is used to reduce the input impedance of the ADC for better predictability.
The third-order Butterworth filter is designed with a source impedance of 70 Ω, a load impedance of 338 Ω, and a 3 dB bandwidth of 360 MHz.
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