myriadrf/lms6002d-docs

Documentation for the Lime Microsystems Field Programmable RF (FPRF) Transceiver IC

lms6002d-docs's Issues

Datasheet 1.2r0: SRXEN/STXEN registers are equivalent to TXEN/RXEN pins

Originally logged by @chemeris : SRXEN/STXEN registers are equivalent to TXEN/RXEN pins. Internal control signals are constructed using logical AND in the following way:
iTXEN = TXEN and STXEN
iRXEN = RXEN and SRXEN

Datasheet 1.2r0: RXTIA is a synonym for RXVGA1

Originally logged by @chemeris : RXTIA is a synonym for RXVGA1. TIA stands for Trans Impedance Amplifier. That was the initial block name but changed later to RX VGA1 for simplicity. "RX TIA" may still be used somewhere in the documents.

Datasheet 1.2r0: 4.1 "General DC Calibration Procedure" procedure is incomplete

Originally logged by @chemeris: "4.1 General DC Calibration Procedure" procedure is incomplete and often shows failure when it actually completes fine. Refer to FAQ, question 4.7 for a workaround.

Datasheet 1.2r0: Peak detector measures signal level at the TX output

Originally logged by @chemeris : Peak detector measures signal level at the TX output. The idea was to use it for TX LO leakage calibration but its dynamic range is not good enough. Even uncalibrated TX chain produces LO leakage of about -40dBm which is out of the on chip detector range.

Datasheet 1.2r0: LOOPBBEN register is not specified entirely in the documentation

Originally logged by @chemeris : LOOPBBEN register is not specified entirely in the documentation. Check the "LMS6002D IF-RF LoopBack Options.pdf" for a diagram of its connections and the values below for details about controlling it. To use BB loopback you must power down the stage preceding to the one you're connecting loopback to.
LOOPBBEN[1:0]: Baseband loopback switches control
00 – All switches are open (default)
01 – provides TXLPF output to baseband loopback
10 – provides TXVGA1 output to baseband loopback
11 – provides envelop/peak detector output to baseband loopback

Datasheet 1.2r0: "LO Leakage" label

Originally logged by @chemeris: The purpose of the "LO Leakage" label at the "Figure 1: Functional block diagram" is not to show the path of LO leakage. :) Actually it means "LO Leakage Cancellation" and refers to DACs used for that purpose. Refer to the "Calibration and Initialization" section of the datasheet.

preselected RF switch configuration (LMS6002D MyriadRF board)

On page 12 of the MyriadRF Development Kit document (section 3.2, Rev 1.0r4, mod. 3/5/2013), there's a note for the test SMA connectors that says:
"Requires preselected RF switch configuration."

Not sure exactly what this means…

Wondering if this has anything to do with the GPIO table in section 3.7.

I suspect that I'm not getting the kind of output that I expect because I don't' have the "preselected RF switch configuration" set up right.

Does anybody know what this means?
Does anybody know how to set this from the "6002dr2.test" GUI?

Note that I'm using this with a Zipper board.

Thanks in advance..

Datasheet 1.2r0: Envelope detector is in fact peak detector of peak detector

Originally logged by @chemeris : Envelope detector is in fact peak detector of peak detector, it shows IQ imbalance (phase/gain error). Unfortunately, its dynamic range limits its use as a calibration tool.

Datasheet 1.2r0: Figure 3.8 misses an important register

Originally logged by @chemeris: "Figure 3.8: RX FE control" misses an important configuration register "SELOUT[1:0]: Select output buffer in RX PLL". This configuration register must be used together with LNASEL_RXFE to choose LMS6002D input.