EC-TX-A-20/300-34C Broadband Efficient All-Modulation ... · PDF fileBroadband Efficient All-Modulation (BEAM) Transmitter ... EC-TX-A-20/300-34C Broadband Efficient All-Modulation

Broadband Efficient All-Modulation

(BEAM) Transmitter

V1.3 PRELIMINARY April 2017

EC-TX-A-20/300-34C Broadband Efficient All-Modulation (BEAM) Transmitter

Product Summary

Key Features

200-3000 MHz continuous tuning

range

+34 dBm peak output power

PA CW efficiency >50% at all

frequencies

Modulation agnostic: GMSK,

QAM, LTE, etc.

Optional harmonic filter

Switch-mode GaN power

amplifier

Envelope tracked using maximum

efficiency polar modulation

Max instantaneous signal

bandwidth 10 MHz (min)

External RF local oscillator for

application flexibility

Digital interface for modulation:

40 Msps

12 bit I, 12 bit Q over a 6 bit bus

Description

The EC-TX-A-20/300-34C Broadband Efficient All-Modulation

(BEAM) Transmitter Module transmitter is an integrated

assembly that provides very high efficiency RF signal power

for all modulation types by using envelope tracked direct polar

technology. All functions are internal, including the quadrature

to polar conversion, phase modulator, envelope modulator,

and switch-mode power amplifier (SMPA). Calibrated

corrections are also internal.

Options are available to include internal harmonic rejection

filters. This filter structure covers the entire tuning bandwidth

of the BEAM transmitter.

A digital interface provides control of the BEAM transmitter,

and includes the streaming of quadrature signal samples of

the modulation baseband. Interface protocol is based on that

of the AD9361 from Analog Devices, Inc.

Reference design for the power supply arrangement for the BEAM transmitter based on a single +12V input is available.

Figure 1: The block diagram for the BEAM TX module showing the digital data & control inputs and the RF input/output


(BEAM) Transmitter


Parameter V5 V5.1 V6 V7 Product Release

Integration Ext. FPGA Board w/ FMC Interposer FPGA board Onboard FPGA Digital ASIC Mixed Signal ASIC

Release Data 11/2016 Q1/2017 Q2/2017 Q3/2017 Q1/2018

PCB Area 2.5" X 5.05" 2.5" X 5.05" 2.5" X 7" 2.5" X 6" 2.5" X 3"

Added PCAs 1 FPGA Eval Board Eridan FPGA Board None None None

Table 1: The rollout plan for the BEAM TX module integration.

Figure 2: 5 MHz LTE (+29 dBm Signal Power)

Figure 3: WCDMA @ 1900 MHz (<1% EVM)

Figure 4: 256 QAM @ 32 Mbps (<1% EVM)

Figure 5: GMSK @ 850 MHz Figure 6: EDGE @ 850 MHz Figure 7: 1.4 MHz LTE

0

1

2

3

4

5

6

7

8

9

10

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

Pow

er /

Ou

tpu

t p

ow

er (

No

rmal

ized

)

Circuit Energy Efficiency

Input Power

Power Dissipation

Power supply size

Heatsinksize

2016 commercial PA for LTE

Eridan Communications

TX power

LTE WCDMAGMSK

Figure 8: The Energy Efficiency of the BEAM DPS-PA

combination is a function of both frequency and modulation (combined total efficiency shown here for 700MHz).

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

0 500 1000 1500 2000 2500 3000 3500

TAE

Frequency (MHz)

Figure 9: The efficiency of the final stage PA as a function of carrier frequency. This efficiency is multiplied with the modulator

efficiency to yield the performance in Figure 8.


(BEAM) Transmitter


Specifications

Subsystem Details Amplitude Modulator/SMPA Controller Phase Mod Freq. Synth LPF

V5.1 See Figures 10-12 890mW 1.05W External 0.2dB

Product See Figures 10-12 250mW 300mW 100mW 0.2dB

V5.1 Specs

Parameter Min Typ Max Unit Test Conditions/Comments

DC Power (Non-Power Stages) Voltage Current Consumption

316

12 322

415

V mA

Frequency dependent

RF Input Frequency

LO Input Power Impedance

200 -6

50

3000

6

MHz dBm Ω

SMA connector

RF Output Frequency

TX Output Power Impedance

200 -38

50

3000 34

MHz dBm Ω

SMA connector ⇒ 𝜌, 𝜃

Digital Interface Logic Levels

Low High SPI Clock Frequency Rise/Fall Time Data In Bits Rate

.1

0

2.5

.5 5

12 40

1

V V MHz ns bits MHz

FMC connector I-Q quadrature format

Figure 10: TX Output Power

Figure 11: SMPA + Amplitude Modulator Power Consumption at the Power Levels of Figure 10

Figure 12: SMPA + Amplitude Modulator Stack Efficiency at the Power Levels of Figure 10


(BEAM) Transmitter


Digital Interface Pin Configuration and Descriptions

A B C D E F G H J K

1 GND NC GND NC GND NC GND NC GND NC

2 NC GND NC GND NC GND REFCLK_P BOARD_PRSNT NC GND

3 NC GND NC GND NC GND REFCLK_N GND NC GND



6 NC GND NC GND NC GND DATACLK_P GND NC GND

7 NC GND NC GND NC NC DATACLK_N NC NC NC


9 GND NC GND NC NC GND NC GND NC GND

10 NC GND NC GND NC NC NC NC NC NC

11 NC GND NC NC GND NC GND NC GND NC

12 GND NC GND NC NC GND FBCLK_P GND NC GND

13 GND NC GND GND NC NC FBCLK_N NC NC NC

14 NC GND TXDATA0_P FRAME_P GND NC GND NC GND NC

15 NC GND TXDATA0_N FRAME_N NC GND TXDATA2_P GND NC GND

16 GND NC GND GND NC NC TXDATA2_N TXDATA1_P NC NC

17 GND NC GND TXDATA3_P GND NC GND TXDATA1_N GND NC

18 NC GND TXDATA4_P TXDATA3_N NC GND ENABLE GND NC GND

19 NC GND TXDATA4_N GND NC NC TXNRX TXDATA5_P NC NC

20 GND NC GND NC GND NC GND TXDATA5_N GND NC

21 GND NC GND NC NC GND CTRL_OUT2 GND NC GND

22 NC GND SYNCIN GND NC NC CTRL_OUT3 CTRL_OUT0 NC NC

23 NC GND RESETIN CTRL_IN0 GND NC GND CTRL_OUT1 GND NC

24 GND NC GND CTRL_IN1 NC GND CTRL_OUT6 GND NC GND

25 GND NC GND GND NC NC CTRL_OUT7 CTRL_OUT4 NC NC

26 NC GND NC NC GND NC GND CTRL_OUT5 GND NC

27 NC GND NC NC NC GND NC GND NC GND

28 GND NC GND GND NC NC NC CTRL_IN2 NC NC

29 GND NC GND NC GND NC GND CTRL_IN3 GND NC

30 NC GND NC RESERVED NC GND SPIA_SSN GND NC GND

31 NC GND NC RESERVED NC NC SPIB_SSN NC NC NC


33 GND NC GND NC NC GND SPI_MOSI GND NC GND

34 NC GND NC NC NC NC SPI_MISO NC NC NC

35 NC GND NC NC GND NC GND SPI_SCK GND NC

36 GND NC GND NC NC GND NC GND NC GND

37 GND NC NC GND NC NC NC NC NC NC

38 NC GND GND NC GND NC GND NC GND NC

39 NC GND NC GND RESERVED GND RESERVED GND RESERVED GND

40 GND NC GND NC GND RESERVED GND RESERVED GND RESERVED

TX Data

Clocks and alignment

Enable signals

Reserved control signals

Reset

SPI signals

Board present

Ground

Not connected

Figure 13: FPGA FMC connector pin configuration.


(BEAM) Transmitter


Signal Description

TXDATA [5:0] Differential transmit data interface from SDR. In the first implementation of the BEAM, bits [5:0] are used to carry digitized IQ data. This is transmitted as DDR (Dual Data Rate) at a clock rate of 80 MHz.

REFCLK 40 MHz differential timebase clock originating at the SDR.

DATACLK 80 MHz differential clock derived from REFCLK, drives the SDR.

FBCLK 80 MHz differential DATACLK phase-shifted to time-align with TXDATA.

FRAME 40 MHz differential alignment signal for TXDATA.

ENABLE Enables transmit function of BEAM. Active high.

TXNRX Transmit low, receive high control signal to the BEAM.

CTRL_OUT0 - CTRL_OUT7 Reserved signals for command and control from the SDR.

CTRL_IN0-CTRL_IN3 Reserved signals for command and control to the SDR.

SYNCHIN Reserved signal.

RESETIN Reset signal from the SDR. Resets registers in the BEAM.

SPIA/B_SSN SPI Chip select controls from the SDR.

SPI_MOSI SPI Data out from the SDR.

SPI_MISO SPI Data in to the SDR.

SPI_SCK SPI Clock from the SDR.

BOARD_PRSNT Indicates presence of BEAM. Active low


(BEAM) Transmitter


Typical Performance Characteristics Power and Efficiency Measurements

Figure 14: TX Output Power vs. LO Frequency for Various Modulations

Figure 15: SMPA+Amp. Mod. DC Power Consumption vs. LO Frequency at the Power Levels of Figure 14

Figure 16: SMPA Drain Efficiency vs. LO Frequency at the Power Levels of Figure 14

Figure 17: SMPA+Amp. Mod. Stack Efficiency vs. LO Frequency at the Power Levels of Figure 14

Figure 18: Amplitude Modulator Efficiency vs. Signal PAPR Figure 19:LTE 10MHz Downlink Signal Resource Block Back-off at 700MHz


(BEAM) Transmitter


300MHz Frequency Band 800MHz Frequency Band

Figure 20: TX Output Spectrum for an LTE 10MHz SCFDMA Signal in the 300MHz Band


Figure 22: TX Output Spectrum for an Edge Signal in the 300MHz Band


Figure 24: TX Output Spectrum for a GMSK Signal in the 300MHz Band



(BEAM) Transmitter










(BEAM) Transmitter










(BEAM) Transmitter


Sample Data

WCDMA Frequency

(MHz) Output Power (dBm)

Stack Efficiency

Drain Efficiency (SMPA)

300 27.26 46.53 67.38

800 27.35 46.07 69.29

1300 26.95 39.33 63.18

1800 27.02 37.41 64.32

2300 25.95 30 50.3

2800 26.85 35.36 62.02

Figure 41: WCDMA sample data.

LTE 1.4MHz SCFDMA Frequency


Stack Efficiency


300 25.48 44.12 68.95

800 25.6 43.7 70.85

1300 25.24 37.25 65.21

1800 25.33 35.64 66.87

2300 24.28 28.69 52.58

2800 25.35 34.73 67.42

Figure 40: LTE 1.4MHz SCFDMA sample data.

GMSK Frequency


Stack Efficiency


300 33.86 56.43 63.90

800 33.87 55.91 64.00

1300 33.31 47.47 56.30

1800 33.07 42.79 53.45

2300 31.68 33.45 38.81

2800 31.40 32.53 36.41

Figure 43: GMSK sample data.

Two Tone Frequency


Stack Efficiency


300 30.87 53.25 66.01

800 30.92 52.85 66.51

1300 30.41 44.83 59.71

1800 30.34 41.69 58.80

2300 29.09 32.95 44.11

2800 29.37 35.43 47.09

Figure 38: Two-tone modulation sample data.

LTE 10MHz SCFDMA Frequency


Stack Efficiency


300 26.38 44.54 69.65

800 26.48 44.20 70.00

1300 26.10 37.87 64.20

1800 26.17 36.21 65.40

2300 25.15 29.27 52.24

2800 26.10 34.79 65.26

Figure 39: LTE 10MHz SCFDMAsample data.

EDGE Frequency


Stack Efficiency


300 30.86 54 68.72

800 30.88 53.44 69.11

1300 30.39 45.17 61.78

1800 30.3 41.92 60.69

2300 29.08 33.42 45.86

2800 29.37 35.89 49.12

Figure 42: EDGE sample data.

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EC-TX-A-20/300-34C Broadband Efficient All-Modulation ... · PDF fileBroadband Efficient All-Modulation (BEAM) Transmitter ... EC-TX-A-20/300-34C Broadband Efficient All-Modulation