HMC1197LP7FE datasheet(51/57 Pages) AD

51 / 57 page

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HMC1197LP7FE

v03.0314

Wideband direct Quadrature Modulator

w/ Fractional-n Pll & Vco, 100 - 4000 MHz

inputs floating which generates excessive current flow that may cause damage to the IC. The baseband

inputs should be pulled down to GND in shutdown mode. The nominal baseband input AC Voltage used in

the characterization of the HMC1197LP7FE is 1.3Vpp differential. The baseband input AC voltage can be

varied to optimize overall modulator performance.

It is recommended to drive the baseband inputs differentially to reduce even-order distortion products and

also use reconstruction filters at the baseband inputs to avoid aliasing

I/Q modulator includes a LO quadrature phase splitter that generates two carrier signals in quadrature

followed by LO limiting amplifiers which are used to drive the I and Q mixers with saturated signal levels.

Therefore, the LO path is immune to large variations in the LO input signal level and the modulator

performance does not vary much with LO input power.

After upconversion, the outputs of the I and Q mixers are summed together differentially and converted

to single- ended RF output. The single-ended RF output port is internally matched to 50 Ohms and does

not require any external matching components. Only a standard DC-blocking capacitor is required at this

interface.

3.3

Harmonic low Pass Filter

High LO harmonic content causes amplitude and phase mismatches and ultimately performance

degradation in modulator sideband rejection.

-80

-70

-60

-50

-40

-30

-20

-10

-80

-70

-60

-50

-40

-30

-20

-10

hmc701 Sweeper Plot 11:18:12 AM 3/19/2012

LO HARMONIC LEVEL (dBc)

3rd LO Harmonic

2nd LO Harmonic

Targeted minimum LO harmonic level

Targeted maximum modulator

sideband rejection

Figure 44. Typical impact of 2nd and 3rd LO harmonic on sideband rejection.

As shown in Figure 44, in a typical modulator with 1xLO input both the 2nd and 3rd LO harmonics affect

the modulator sideband rejection performance at levels > -20 dBc relative to the LO signal power. It also

shows that the 3rd LO harmonic has greater impact on modulator sideband rejection performance than the

2nd, and that there is little effect of the 2nd LO harmonic on modulator sideband rejection once the 2nd LO

harmonic is below -20 dBc levels, relative to the LO signal level.

Figure 45 shows the typical insertion loss of the low pass filter.

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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

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