Texas Instruments TRF1500 manual High-Band Cascaded 1dB Input Compression Point

Page 46

SWRA004A

6)Connect the EVM IF output port, J21 to the spectrum analyzer.

7)Measure the Fundamental output power at the IF frequency (FFund).

8)Measure the Intermodulation products (2F2 - F1 or 2F1 - F2) at FIF ± 120 kHz

9)Calculate the Intermodulation Suppression as:

Intermodulation Suppression = FFund - Intermodulation product

10) Calculate the Input Third -Order Intercept Point as:

Input Third-Order Intercept = ((Intermodulation

Suppression/2) + (RF Pin))

High-Band Cascaded: 1dB Input Compression Point

Control state: 111001

SEE APPENDIX A: TEST BENCH SETUPS

Test setup Figure 20

The 1 dB input compression point is the RF input power at which the gain compresses 1 dB. Gain compression is when an increase in Pin causes no further increase in the output power (Pout). The measurement is performed using two RF sources and a spectrum analyzer.

1)Set the RF source frequency (see Table 4) and the input power (Pin) to -35 dBm. Connect the RF source to the EVM RF input port, J20.

2)Set the LO source frequency and input power (see Table 4). Connect the LO source to the EVM LO input port, J12.

3)Set the spectrum analyzer to measure the output power at the IF frequency.

4)Connect the EVM IF output port, J21, to the spectrum analyzer.

5)Measure the output power (Pout) at the IF frequency

6)Calculate Gain as:

Gain = Pout - Pin

7)To determine the 1 dB compression point, the RF Pin is increased in steps of 1 dBm until the gain compresses by 1 dB. Repeat step 4 and 5 until the gain compresses by 1dB.

TRF1500 Integrated Dual-Band RF Receiver User’s Guide

47

Image 46

Contents TRF1500 Integrated Dual-Band RF Receiver User’s Guide Important Notice Trademarks PIC Telephone Contents Appendix a Test Bench Configuration Figures TablesTRF1500 Integrated Dual-Band RF Receiver User’s Guide AbstractProduct Support Ingl E Chip Anal OG AS E BRelated Documentation World Wide WebIntroduction External Components Design ConsiderationsBoard Design and Impedance Matching TRF1500 Dual-Band Receiver Block Diagram TRF 1500 Dual-Band ReceiverPin Descriptions Pin Number Name DescriptionStrong Signal TRF1500 Control State Control State and the Corresponding Active CircuitsCascaded Block Diagram of the Low-Band Receiver Section Low-Band LNA Low-Band LNA Turn on TimeLow-Band LNA Input Low-Band LNA OutputLow-Band LNA Output Configuration Surface Acoustic Wave SAW FilterLow-Band Mixer Low-Band Mixer RF InputLow-Band Mixer LO Input Low-Band if OutputLow-Band if Output Configuration Low-Band LO Buffer Amplifier OutputLow-Band Buffer Amplifier Output Configuration Low-Band Cascaded Test Guide LOW-Band Cascaded Power Conversion GainLB LNA, LB Mixer, SAW Filter, and LB if Amp Parameters Low-Band Cascaded Power Conversion Gain Reduction Low-Band Cascaded Noise Figure TRF1500 Integrated Dual-Band RF Receiver User’s Guide Low-Band Cascaded RF Input Return Loss Low-Band Cascaded LO Input Return LossLOW Band LO Buffer Output Power Low-Band Power Leakage LO In to RFLow-Band Cascaded Third Order Input Intercept Point IIP3 Low-Band Cascaded 1dB RF Input Compression Point Low-Band Cascaded 1dB Blocking Point Block Diagram of the High-Band Receiver Section High-Band RF Input High-Band LO InputHigh-Band LO Frequency Doubler Driven Configuration High-Band if Output Configuration High-Band if OutputHigh-Band LO Buffer Amplifier Output Configuration High-Band LO Buffer Amplifier OutputHigh-Band Cascaded Test Guide High-Band Cascaded Power Conversion GainHB LNA, HB mixer, HB if amp High-Band Cascaded Power Conversion Gain Reduction High-Band Cascaded Image Rejection High-Band Cascaded Noise Figure High-Band Cascaded RF Input Return Loss High-Band LO Buffer Output Power High-Band Cascaded Power Leakage LO In to RF High-Band Cascaded Third Order Input Intercept Point IIP3High-Band Cascaded 1dB Input Compression Point High-Band Cascaded 2X2 Spur Performance High Band 3X3 Spur Performance Low- and High-Band Transmit Mixer Low-Band and High-Band TransmitLow-Band and High-Band Transmit Mixer RF Input Low- and High-Band Transmit Mixer RF Input Configuration Low- and High-Band Transmit Mixer if Output ConfigurationLow-Band Transmit Mixer Test Guide Low-Band Transmit Mixer Power Conversion GainLow-Band Transmit Performance Parameters Low-Band Transmit Mixer Noise Figure Low-Band Transmit Mixer Input Return Loss Low-Band Transmit Mixer Power Leakage LO In to TX Low-Band Transmit Mixer Power Leakage TX In to LOLow-Band Transmit Mixer 1dB Input Compression Point See Appendix a Test Bench Setups See Appendix a Test Bench Setups High-Band Transmit Mixer Test Guide High-Band Transmit Mixer Performance ParametersLow-Band LNA Input Return Loss Low-Band LNA Stand-Alone Test GuideLow-Band LNA Gain Low-Band LNA ParametersLow-Band LNA Isolation Low-Band LNA Output Return LossLow-Band LNA 1dB Input Compression Point Low-Band LNA Noise Figure Low-Band LNA Third Order Input Intercept Point IIP3 TRF1500 Integrated Dual-Band RF Receiver User’s Guide Low-Band Receiver Mixer Stand-Alone Test Guide Low-Band Receiver Mixer Power Conversion GainLow-Band Receiver Mixer Parameters Low-Band Receiver Mixer Input Return Loss Low-Band Receiver Mixer Power Leakage LO In to RF Low-Band Receiver Mixer Noise FigureTRF1500 Integrated Dual-Band RF Receiver User’s Guide Low-Band Receiver Mixer 1dB RF Input Compression Point 12.2 11.4 10.4 ←1dB Compression Point TRF1500 Integrated Dual-Band RF Receiver User’s Guide Appendix a Test Bench Configuration Test Bench Setup Noise Figure Test Bench Setup Power Leakage RF In to LO In Measurements Test Bench Setup LNA 1dB Input Compression Point