Q-Tech Corp. has expanded its QT2020/QT2021 Series of microcomputer compensated crystal oscillators (MCXOs). These new radiation-tolerant devices offer expanded PPB stability levels for tight frequency stability performance, fast start-up, and low size, weight, and power (SWaP) for a range of New Space applications.

Claiming the first and only space-qualified MCXOs in the market, these devices can withstand radiation levels of 50 kRad(Si) TID and offer a minimum single-event latch-up (SEL) of 29 MeV-cm²/mg for the QT2020 series and up to 75 MeV-cm²/mg for the QT2021 series. Power consumption is 90 mW maximum for both devices, which is thirty orders of magnitude lower than comparable oven-controlled crystal oscillators (OCXOs), according to Q-Tech.

(Source: Q-Tech Corp.)

The radiation-tolerant MCXOs also provide “OCXO-level” temperature stability of up to ±10 ppb over the temperature range of 0°C to 70°C. In addition to ±20 ppb, they also now offer ±50 ppb and ±100 ppb stabilities over the temperature range of -40°C to 85°C.

Devices in the QT2020 and QT2021 MCXO series are offered with 1-PPS input and output, standard frequencies of 10, 20, 30, 40, 50, 60, 80, and 100 MHz, and a choice of CMOS or sine wave logic outputs. They also have a small-form-factor package, weighing 50 g compared to OCXOs at 100 g or more, Q-Tech said. Devices measure 25.40 × 50.80 × 8.26 mm.

The low phase noise and jitter, along with high shock and vibration tolerance (G-sensitivity of 1 ppb/g), make them suitable for a range of applications that require smaller SWaP or a fast start-up time (1.5 s to ±50 ppm) and initialization time (as low as 15 s from power on to full ppb performance) to support frequent power cycling, the company said.

Q-Tech will showcase the new MCXOs at the IEEE International Microwave Symposium (IMS), June 15-20.

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