SPD1103-111

For Phase Locked VCOs to 22 GHz
Reference Frequencies Below 50 MHz
New Surface Mount Package Design
Small Footprint (90 x 110 Mils)
Automated Chip on Board Construction

• For Phase Locked VCOs to 22 GHz
• Reference Frequencies Below 50 MHz
• New Surface Mount Package Design
• Small Footprint (90 x 110 Mils)
• Automated Chip on Board Construction

Alpha has redesigned SPD1103-111 product line of sampling phase detectors using automated chip on board manufacturing technology to provide a more uniform, surface mountable, small footprint device without sacrificing the microwave performance of the original design.

Sampling phase detectors SPD1103-111 are used to phase lock a microwave VCO to a stable reference source at a submultiple frequency. The sampling phase detector
consists of a step recovery diode, capacitors and a microwave mixer consisting of series pair Schottky diodes. The principle of operation may be described as
using the step recovery diode to generate a harmonic comb of the reference oscillator frequency and the Schottky diode as a mixer between the closest reference frequency multiple and the microwave signal generated by the VCO. When these frequencies are identical the IF (beat note) signal is a DC voltage; the IF will be sinusoidal when the frequencies are unequal.

The SPD1100 series sampling phase detectors use a selected step recovery diode chip whose carrier lifetime and transition time are appropriate for use in applications allowing reference frequencies below 50 MHz and microwave VCO frequencies as high as 22 GHz. TheSchottky diodes used are low capacitance devices capable of efficient mixer performance at frequencies above 22 GHz. The SPD1101-111, SPD1102-111 and SPD1103-111 utilize low, medium and high barrier Schottky diodes and may be selected according to the available power generated by the microwave VCO.