Radar Front End ICs
AD9213 & AD9914 Alternatives for Radar Engineers

Radar Front-End Signal Chain: Complete Solution

Modern pulse-Doppler, FMCW, and phased-array radar systems demand the widest possible instantaneous digitization bandwidth, highest dynamic range, and lowest system noise. These requirements drove the adoption of GHz-speed ADCs, frequency-agile DDS excitation sources, and ultra-wideband track-and-hold amplifiers — hardware that, until recently, was sourced exclusively from Analog Devices and Hittite.

Radivix supplies a fully integrated, export-compliant radar signal chain: RVX1214PPB → AD9213 RVX2212ME → AD9914 RVX01ME → HMC661

All three ICs are manufactured and distributed from Hong Kong, outside US export control jurisdiction, enabling procurement for defense radar programs in the Middle East, CIS, and Southeast Asia without EAR/ITAR delays or licensing risk.

RVX1214PPB — AD9213 Alternative: 12.8 GSPS ADC

The RVX1214PPB is a 12-bit, 12.8 GSPS analog-to-digital converter designed for wideband radar receiver digitization. At full sample rate, it delivers an instantaneous bandwidth of 5 GHz, sufficient to capture signals across multiple radar bands simultaneously in a direct-RF or sub-Nyquist sampling architecture.

The measured SNR performance of 55.9 dBFS at a 1 GHz input frequency is a validated, measured result documented in the Radivix characterization datasheet — not an extrapolated figure. This level of dynamic range supports target detection in the presence of strong clutter or jamming signals typical of contested electromagnetic environments.

Key Specifications

JESD204B Interface

RVX1214PPB outputs digitized samples over a JESD204B high-speed serial interface. The lane configuration supports up to 16 differential lanes at speeds compatible with standard FPGA transceivers (Xilinx UltraScale+, Intel Arria 10/Agilex). JESD204B subclass 1 operation is supported for deterministic latency applications such as multi-channel coherent digitization in phased array elements.

RVX2212ME — AD9914 Alternative: 3.5 GSPS DDS

The RVX2212ME is a direct digital synthesizer operating at up to 3.5 GSPS system clock, generating frequency-agile output waveforms for radar transmit excitation, LO chain injection, and chirp generation. It replaces the Analog Devices AD9914 in defense radar and electronic warfare designs.

With a 48-bit frequency tuning word (FTW), RVX2212ME achieves sub-millihertz frequency resolution — critical for narrow-bandwidth Doppler radar modes and coherent frequency-shift keying (CFSK) waveforms. The 12-bit DAC output maintains low spurious performance suitable for radar transmitter chains.

Key Specifications

Frequency Agility for Radar Excitation

Frequency-agile radar waveforms — LFM chirp, FHSS, stepped frequency, and polyphase codes — require excitation sources capable of reprogramming frequency within a single pulse repetition interval. The RVX2212ME achieves frequency hops in under 10 ns, enabling agile waveforms across X-band and Ku-band radar (after upconversion from the DDS baseband output).

RVX01ME — HMC661 Alternative: 18 GHz Track-and-Hold

The RVX01ME is a wideband track-and-hold amplifier with 18 GHz analog input bandwidth, replacing the Hittite HMC661LC4B. It serves as the first active signal-conditioning stage in mm-wave radar receivers and direct-sampling EW front ends, presenting a low-aperture-jitter, held sample to the subsequent ADC.

At millimeter-wave frequencies (24–94 GHz radar bands), the T&H stage enables sub-sampling architectures where the ADC operates at a fraction of the RF input frequency. The RVX01ME's 18 GHz tracking bandwidth supports direct aperture capture of signals in the K-band and Ka-band radar windows without a downconversion mixer stage.

Key Specifications

Complete Radar Signal Chain

The Radivix radar signal chain integrates all three ICs into a validated front-end architecture suitable for wideband pulse-Doppler, FMCW, and active phased array radar designs.

Receive Chain (Antenna to FPGA)

  Antenna
     │
     ▼
  [LNA / BPF]                    ← RF front-end (external)
     │
     ▼
  RVX01ME (T&H, 18GHz BW)       ← 18GHz aperture capture
     │  held sample
     ▼
  RVX1214PPB (12.8GSPS ADC)     ← 12-bit digitization, SNR 55.9dBFS@1GHz
     │  JESD204B (up to 16 lanes)
     ▼
  [FPGA — Pulse Compression / CFAR / Beamforming]
          

Transmit / Excitation Chain

  [FPGA — Waveform Command]
     │  SPI / parallel
     ▼
  RVX2212ME (3.5GSPS DDS)       ← 48-bit FTW, <10ns hop, LFM/FHSS
     │  analog IF output
     ▼
  [DAC filter / upconverter]    ← Upconvert to X/Ku/Ka-band
     │
     ▼
  [PA → Antenna]
          

Clock Distribution (JESD204B)

Both RVX1214PPB and RVX2212ME require a clean, high-frequency reference clock. For multi-channel phased array systems, RVX01AME (HMC7043 alternative) distributes a coherent reference to all ADC and DDS devices with sub-ps channel-to-channel skew, ensuring JESD204B subclass 1 deterministic latency.

Applications

Pulse-Doppler Radar

Pulse-Doppler radar requires high dynamic range ADCs to suppress range sidelobes and detect slow-moving targets in ground clutter. RVX1214PPB's 55.9 dBFS SNR at 1 GHz and JESD204B output support wideband I/Q digitization chains for medium-range and airborne fire-control radar.

FMCW Radar

Frequency-modulated continuous wave radar for automotive, terrain-following, and proximity fusing applications demands precise chirp generation. RVX2212ME's 48-bit FTW and 3.5 GSPS clock enable sub-millihertz chirp slope accuracy and rapid chirp reset between sweep intervals.

Phased Array Radar

Digital beamforming phased arrays require per-element ADC and DAC chains with phase-coherent clocking. JESD204B subclass 1 from RVX1214PPB, combined with RVX01AME clock distribution, ensures phase-aligned digitization across all array elements — enabling adaptive nulling, monopulse tracking, and space-time adaptive processing (STAP).

Electronic Warfare Receivers

EW receivers must instantaneously digitize wide RF bands to detect, classify, and geo-locate emitters. The combination of RVX01ME's 18 GHz tracking bandwidth and RVX1214PPB's 12.8 GSPS sample rate supports direct-RF and sub-Nyquist EW digitizer architectures covering multiple radar and communication bands simultaneously.

FAQ — Radar Engineers