ALL-STANDARD-ALL-BAND POLAR MODULATOR FOR DIGITAL TELEVISION BROADCASTING
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1 ALL-STANDARD-ALL-BAND POLAR MODULATOR FOR DIGITAL TELEVISION BROADCASTING Martínez Alonso Abdel and Okada Laboratories Tokyo Institute of Technology
2 Outline 1 Motivation TxMER degradation Direct Polar Modulator Design Conclusion
3 Worldwide Frequency Allocation 2 VHF/UHF/L/S Bands Terrestrial Satellite (IF) Mobile Cable Frequency [GHz] Integrated All-standard Modulator hasn t been reported yet.
4 UHDTV Broadcasting Roadmap K = 16 x FHD! K Test Broadcast Bit Rate = 91.8 Mb/s 4K/8K Full Scale Broadcasting (Tokyo Olympics) Increasing data rates 4K Test Broadcast Bit Rate = 35 Mb/s Higher order modulation schemes *From Promoting the Advancement of Broadcasting Services: the Road Map to 4K and 8K. MIC
5 Outline 4 Motivation TxMER degradation Direct Polar Modulator Design Conclusion
6 BER over AWGN 1,E+00 E b /N 0 = C/N * BW/R s x m 5 BER 1,E-01 1,E-02 1,E-03 1,E-04 1,E-05 1,E-06 16QAM 256QAM 4096QAM 12.2 db 21.1 db 31.2 db Quasi Error QPSK 8.3 db 64QAM 16.5 db 1024QAM 26.1 db 16KQAM 36.5 db Free E b /N 0 [db]
7 Digital Television Evolution 6 Standard Modulation Data Rate [Mb/s] BW [MHz] Required C/N [db] (spec) TxMER [db] (typical) DVB-S QPSK SC > 8.4 > 38 DVB-S2 8PSK SC > 7.9 > 38 DVB-S2X 16APSK SC > 12 > 42 DVB-C 64QAM SC > 26 > 40 DVB-C2 4096QAM OFDM > 34.8 > 40 DTMB 64QAM OFDM > 14.9 > 40 DTMB-A 256- APSK OFDM > ISDBT-T/Tb 64QAM OFDM > 22 > 40 8K Super Hi- Vision 4096QAM OFDM > 35.7* > 45* *From Super Hi-Vision Terrestrial Transmission Test. NHK STRL
8 TxMER degradation 7 Tx error sources: AWGN LO Phase Noise I/Q imbalance LO leakage/pulling DAC error PA compression
9 Direct Conversion Modulator 8 I/Q imbalance DAC error AWGN LO leakage/pulling LO Phase Noise PA compression
10 Direct Polar Modulator 9 Slow operation speed PA compression AWGN Spurious DAC error becomes critical
11 Direct Polar Modulator Advantages: No I/Q mismatch Low Phase Noise Low LO leakage/pulling Supports effortless digital modulation Better scaling with CMOS technology Challenges: 50 MHz MHz band operation DAC errors becomes critical Spurious performance TxMER 10 TxMER
12 Outline 11 Motivation TxMER degradation Direct Polar Modulator Design Conclusion
13 Direct Polar Modulator 12 RF-DDFS Design:
14 RF-DDFS Design 13 Classic Digital Mapping DDFS: DDFS out = A*sin(ωt + ϴ) [2]
15 RF-DDFS Design 14 Proposed Complementary Dual Phase Latch-Based (CDPL) DDFS: T = 24 bits A = 10 bits P = 14 bits
16 RF-DDFS Design Phase Accumulator (PA 2 bits) : 15 p1 p2 p3 p1 p2 p3
17 RF-DDFS Design 16 Floorplan view (CMOS 65nm) 460 µm SPI µm Control 57.2 µm PAC 224 µm 230 µm PA 138 µm
18 RF-DDFS Design 17 Performance Comparison: Reference Arch. T P A Technology Sampling Rate (GS/s) Area (mm 2 ) Power (mw) FF DDFS Digital Mapping CMOS 65 nm CDPL DDFS Digital Mapping CMOS 65 nm CDPL-DDFS can achieve a higher sampling rate and lower power consumption when compared with a Flip- Flop approach.
19 RF-DDFS Design 18 Master Clock (GHz) 8,00 6,00 4,00 2,00 Maximum Frequency (CMOS) JSSC APCCAS VLSIC This Work 0,00 ISSCC Year 0.25 µm CMOS 0.35 µm CMOS 0.13 µm CMOS 0.18 µm CMOS 0.09 µm CMOS µm CMOS
20 RF-DDFS Design 19 Performance Comparison: Reference JSSC 04 *APCCAS 08 VLSIC 09 *TCSI 11 (Without DAC) ISSCC 14 This Work (Without DAC) Arch. Digital Mapping Nonlinear DAC Nonlinear DAC Digital Mapping Nonlinear DAC Digital Mapping T (PA bits) A (DAC bits) CMOS Technology Sampling Rate (GS/s) Area (mm 2 ) PE (W/GS/s) SFDR (dbc) µm nm 4 N/A nm µm nm nm
21 Direct Polar Modulator 20 RF-DAC Design:
22 RF-DAC Design 21 Interleaved DAC architecture: DAC-A DAC-B
23 Outline 22 Motivation TxMER degradation Direct Polar Modulator Design Conclusion
24 Conclusions K and 8K ultra-high-definition video technology is already making inroads into broadcasting. 2. Integrated All-Standard-All-Band Modulator is proposed: High TxMER Direct Polar Modulator (TxMER > 45 db). Complementary Dual-Phase Latch- Based DDFS (F out = 2.7 GHz). Interleaving RF-DAC. (F out = 2.7 GHz).
25 References 24 [1] D. ANALOG. 3.5 GSPS Direct Digital Synthesizer with 12-Bit DAC, [2] G. Ken. DDS simplifies polar modulation, EDN Network, [3] D. ANALOG. A Technical Tutorial on Digital Signal Synthesis. Web site: [4] M. Shin, et al., The feasibility Study on the 4K-UHD Satellite Broadcasting Service in Ka-Band, ICCE, [5] European Telecommunications Standards Institute. EN V1.3.1, [6] Digital Broadcasting Experts Group. ABNT NBR 15601, [7] Advanced Television Systems Committee. ATSC Digital Television Standard, 2007.
26 ALL-STANDARD-ALL-BAND POLAR MODULATOR FOR DIGITAL TELEVISION BROADCASTING Martínez Alonso Abdel and Okada Laboratories Tokyo Institute of Technology
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