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RF2705G

LOW NOISE, MULTI-MODE, QUAD-BAND, QUADRATURE MODULATOR AND PA DRIVER

RF Micro Devices 

RF2705G

Pin

22

23

24

Pkg

Base

Function

I SIG P

I SIG N

MODE B

DIE FLAG

Description

Interface Schematic

In-phase I channel positive baseband input port.

Best performance is achieved when the ISIGP and ISIGN are driven differ-

entially with a 1.2V common mode DC voltage. The recommended differ-

ential drive level (VISIGP-VISIGN) is 1.2VP-P for EDGE, 0.8VP-P W-CDMA

modulation and 1.0VP-P for GMSK modulation.

This input should be DC-biased at 1.2V. In sleep mode an internal FET

switch is opened, the input goes high impedance and the modulator is de-

biased.

Phase or amplitude errors between the ISIGP and ISIGN signals will result

in a common-mode signal which may result in an increase in the even

order distortion of the modulation in the output spectrum.

DC offsets between the ISIGP and ISIGN signals will result in increased

carrier leakage. Small DC offsets may be deliberately applied between the

ISIGP/ISIGN and QSIGP/QSIGN inputs to cancel out the LO leakage. The

optimum corrective DC offsets will change with mode, frequency and gain

control.

Common-mode noise on the ISIGP and ISIGN should be kept low as it may

degrade the noise performance of the modulator.

Phase offsets from quadrature between the I and Q baseband signals

results in degrades sideband suppression.

In-phase I channel negative baseband input port. See pin 22.

VCC2

x1

See pin 22.

Mode control pin. See the Logic Truth table.

CMOS Logic inputs: Logic 0=0V to 0.4V; Logic 1=1.4V to VCC.

Ground for LO section, modular, biasing, variable gain amplifier, and sub-

strate.

See pin 6.

Rev A0 DS060206

7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical

support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.

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