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Low Noise Voltage Controlled Oscillators

Wed, 05/30/2001 - 11:55am
Z-Communications introduced the SMV0978L for the 900 MHz ISM band market. The second in a series of products designed for applications where power consumption is the tantamount consideration, the SMV0978L generates frequencies between 975 and 995 MHz within 0.5 - 2.5 V DC of control voltage and is designed for the toughest outdoor applications as it is guaranteed to operate over the extended commercial temperature range of – 40 to 85 °C. This device exhibits a clean spectral signal of – 100 dBc/Hz, typically, at 10 kHz from the carrier, and – 120 dBc/Hz at 100 kHz from the carrier. The second harmonic is attenuated to better that – 12 dBc.

The SMV0978L is intended for the 902-928 MHz ISM band and will find uses in amateur radio, location and monitoring services, radar, and radio-frequency identification tags. This rugged oscillator operates off a 3 V DC source while drawing less than 6 mA, typically, and provides the end user nominally 4 dBm of output power into a 50 Ω load. The technology utilized in the SMV0978L enhances the product's output frequency stability with respect to supply voltage variations (pushing) and output loading variations (pulling). The pulling specification for the SMV0978L is less than 5 MHz/V with a 14 dB return loss, any phase, while pushing is less than 3 MHz within a 5% change of the supply voltage.

The SMV0978L comes in Z-Communications' SUB-L surface mount package measuring 0.30× 0.30× 0.08. This VCO is ideal for automated surface mount assembly and reflow. It is available in tape and reel packaging for production requirements.

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