Texas Instruments TRF1500 manual High-Band Transmit Mixer Test Guide

SWRA004A

High-Band Transmit Mixer Test Guide

This section involves measuring the High Band Transmit Mixer performance. All tests apply for an IF output terminated into a 1 kΩ differential load. To match the IF output to the 50 Ω test equipment a transformer balun is used. All unused ports are terminated into 50 Ω. Testing the performance of the high transmit mixer can be performed two ways. One being the LO Doubler driven, no EVM modification needed. Two LO is directly driven, before measuring the high band transmit mixer performance the EVM board must be modified as follows: Remove L40 and C41, add C24. This enables the high band transmit to be directly driven by an LO source.

Table 6. High-Band Transmit Mixer Performance Parameters

PARAMETERS	Min	Typ	Max	UNIT
Tx Mixer Input Frequency	1850	1880	1910	MHz
LO Frequency Directly Driven	1733	1763	1793	MHz
LO Frequency Doubler Driven	983.5	998.5	1013.5	MHz
Tx Mixer Output Frequency		117		MHz
LO Input Power		-5.0		dBm
RF Input Power		-30		dBm
Power Conversion Gain		9.9		dB
Noise Figure		12.7		dB
RF Input Return Loss		16.6		dB
Power Leakage Tx In to LO In		-55.5		dB
Power Leakage LO In to Tx In		-69.5		dB
1dB Input Compression Point		-15.7		dBm
Second Order Input Intercept point (IIP2)		27		dBm
Third Order Input Intercept Point(IIP3)		-6.7		dBm

To test the High Band Transmit Mixer parameters use the procedure for the Low Band Transmit Mixer, with the following exception: Control state mode 110100 and when testing the Third order intercept point the RF signal separation is 120kHz.

TRF1500 Integrated Dual-Band RF Receiver User’s Guide 59