Manabu Ito

High-performance DSP-TCXO using twin-crystal oscillator

This paper describes a summary of the high stability DSP-TCXO (Digital Signal Processing-Temperature Compensated Crystal Oscillator) based on a high-accuracy temperature detection technology using two AT-cut crystal oscillators and a high-precision frequency compensation circuit.

A new generation DSP-OCXO using crystal temperature sensor

This paper reports on a development and tests of the DSP-OCXO (Digital Signal Processing-Oven Controlled Crystal Oscillator) using AT cut crystal high accuracy temperature sensor which consisting of two thermal equivalent crystals. For the applications of the small size base stations, the DSP-OCXO which has following features: 14 × 9 mm small size, 0.6 W maximum at +25°C low power consumption and +/-20 ppb maximum /-40 to +85°C high frequency stability vs. temperature has been developed.

High stability miniature size OCXO using a SC-cut crystal resonator and simultaneous oscillations

This paper describes a high stability miniature size OCXO using a SC-cut crystal resonator with simultaneous oscillations as the method of taking two signals from one crystal, compared with the Twin-Crystal technology [2] which had the high accuracy temperature sensor by the two crystal units. This 9 × 7 mm size OCXO has satisfied around +/- 1 to 2 ppb in a range of ambient temperature from −40 to +85 °C by the ideal temperature sensor.

Combination of FEM/Harmonic Balance analysis of OCXO

Combination of FEM for thermal analysis and Harmonic Balance oscillation analysis can achieve the highly frequency/temperature stable OCXO such as a few parts per billion frequency/temperature performance for the wide temperature range by simple single oven. This design method basically has been applied to the new OCXO for the LTE(Long Term Evolution)base-station of the next generation of the mobile communication network.