RHF1201

Application information

11/18

Figure 4.

Differential input configuration

7.2.2

Single-ended input configuration

Some applications may require a single-ended input which is easily achieved with the

configuration shown in Figure 5: Single-ended input configuration.

The lack of accurate differential driving with its common-mode noise and even harmonics

cancellation advantages can degrade the rated RHF1201 performance. It is then

recommended to use a well de-coupled DC reference to bias the RHF1201 inputs.

In this case, one can use an AC-coupled analog input and set the DC analog level with high

value (10 k

Ω to 100 kΩ) resistor connected to a proper DC source.

The internal references INCM (0.52 V) or REFP (1 V) can be used as proper DC sources.

Figure 5.

Single-ended input configuration

7.2.3

IF-sampling

The RHF1201 is specifically designed to meet sampling requirements for intermediate

frequency input signals. In particular, the Track-and-Hold in the first stage of the pipeline is

designed to minimize the linearity limitations as analog frequency increases.This is

achieved by making the input impedance independent from the input frequency.

As a result, the RHF1201 can maintain high performance up to an analog frequency of

150 MHz.

RHF1201

VIN

VINB

INCM

50

Ω

10-100pF

330pF

470nF

10nF

Analog source

1:1

ADT1-1

RHF1201

VIN

VINB

50

Ω

10nF

330pF

470nF

10nF

Signal source

DC source or REFP

10-100k

Ω