The HP/Agilent 70311A is a 3 GHz synthesized clock source module designed for integration into the Hewlett-Packard Modular Measurement System (MMS). This precision frequency generator delivers stable, low-noise clock signals across the 16 MHz to 3.3 GHz range, making it essential for high-frequency digital and communication testing. The module provides ±3 dBm sine wave output with exceptional spectral purity and phase noise performance, synchronized via internal reference or external 10 MHz input.
Technical Specifications
Frequency & Tuning
• Frequency range: 16 MHz to 3.3 GHz in 1 Hz steps across eight bands
• External reference input: 10 MHz ± 1 kHz, 50 ohm impedance, 0.224 to 2 V rms amplitude
• Warm-up time: Less than 200 ms to reach frequency and level specification
Output Characteristics
• Output level: ±3 dBm (0 dBm ± 3 dB when switched on; < -50 dBm when off)
• Maximum output power: +20 dBm
• Signal type: Sine wave, AC coupled
• Output impedance: 50 ohms with typical 6 dB return loss
• Connector: N-type female
• Load protection: Rated for any VSWR; maximum 30 V applied voltage
Stability & Purity
• Aging rate: ±2 ppm/year after 1 year of operation
• Temperature stability (0–40°C): ±6 ppm
• Timebase stability: ±2 ppm nominal with internal reference; ±6 ppm/year across 0–45°C
• Harmonics: Less than -30 dBc
• Sub-harmonic rejection: -55 dBc (515–1030 MHz), -40 dBc (1030–2060 MHz), -35 dBc (2060–3300 MHz)
• SSB phase noise at 3.3 GHz: -75 dBc/Hz (1 kHz offset), -115 dBc/Hz (20 kHz offset)
– Key Features
• Eight frequency bands enable fine signal tuning and precision control
• External reference capability synchronizes with 10 MHz standard sources
• Robust output design tolerates any load impedance without damage
• Low phase noise and harmonic suppression ideal for error performance measurement
– Typical Applications
• Clock source for error performance analyzers and pattern generators
• High-frequency digital system testing and validation
• Communication system characterization and synchronization
• Precision timing reference for modular measurement setups
– Compatibility & Integration
The 70311A occupies four MMS module slots and connects via HP-MSIB and GPIB interfaces. It operates with MMS displays such as the HP 70004A and works as a clock source for the HP 71600B Series error performance analyzers. External control is provided through a connected display module; the 70311A itself has no front-panel keyboard.
