TECHNICAL DATA SHEET

PEM010

60 GHz Transmitter (Tx) Waveguide Module

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7

Transmitter Architecture

The PEM010 transmitter uses a double conversion superheterodyne architecture with a sliding IF. The IF frequency is at 1/7

the RF carrier frequency, and the VCO is at 2/7 the RF carrier frequency. The LO is 3x the VCO frequency. The LO and IF are

generated from a built-in synthesizer that has a step size at the RF carrier frequency of either 500 MHz or 540 MHz depending

upon which reference clock frequency is used. The 540 MHz step size uses a 308.571 MHz reference, and the 500 MHz step

uses a 285.714 MHz frequency. The IEEE channels for 802.11ad and 802.11aj are supported when the 540 MHz step size is

used. I and Q analog baseband signals are upconverted to the IF frequency at the input mixers. The IF signal is filtered with

a variable gain amplifier and filter with approximately 20 dB range, which is then mixed with the LO. A notch filter attenuates

the image frequency. The output of the mixer is fed to the PA stage which is coupled to the low-loss waveguide transition.

There are optional FSK/MSK baseband data inputs for non-coherent modulation applications. The overall phase noise and

I/Q balance specifications are sufficient for up to 16 QAM operation. Configuration and settings are controlled through a digital

serial interface port. The block diagram below shows the various stages and circuits in the module.

BB_IP

PA

Var IF

Filter

IF VGA

x3

2

0

90

Div

BB_IM

BB_QP

BB_QM

FMP_Q

FMM_Q

FMP_I

FMM_I

REFCLKP

REFCLKM

Serial Control Registers

+1.5 +2.7

+4

WR-15 Waveguide

UG-385/U Flange

Synthesizer

57.0 to 64.8 GHz 0.5 or 0.54 GHz step

Figure 3 PEM010 Block Diagram