UMZ-671-A16-G

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Voltage Controlled Oscillators (VCOs) are controlled be a voltage signal and used to generate a signal at the required frequency. The UMZ671-A16-G is a typical VCO, used to generate an oscillating signal with a tunable frequency in the UHF (Ultra High Frequency) bandwidth.

The UMZ671-A16-G is composed of active devices such as GaAs FET (Field Effect Transistors). It presents a low phase noise of -79dBc (10kHz) and a low source resistance of 10 ohms. The oscillation frequency range can be tuned from 72 to 77MHz and it exhibits a maximum conversion loss of 7 dB. The UMZ671-A16-G has a double-balanced mixer topology, so it can be considered as two double-balanced mixers in one package.

The working principle of the UMZ671-A16-G can be explained by examining the signal paths inside the VCO. The output frequency, f_O, is the sum of the input frequency, f_I, and the applied voltage, V_DC, times the frequency-voltage control factor, K_VCO. The K_VCO is a gradient factor that is usually given by the manufacturer; it defines how much the output frequency (f_O) increases with the applied frequency (f_I).

In the UMZ671-A16-G, the K_VCO is linear, between -2.5 GHz/V and 1.7 GHz/V. Therefore, when a DC voltage of 1V is applied to the input, the output frequency f_O changes 1V times the K_VCO (depending on the applied frequency). The output of the VCO is connected to the FET gate, which then controls the output frequency.

The UMZ671-A16-G has a wide range of applications, but it is primarily used in wireless communication systems such as GMSK/4FSK modulators and receivers. Thanks to its low source resistance and excellent phase noise, the UMZ671-A16-G is also suitable for mobile phone base stations. Moreover, it can be used in oscillators for pulse and frequency synthesis, RF amplifiers, local oscillators, up-conversion and down-conversion mixers.

In summary, the UMZ671-A16-G is a typical VCO that is used to generate an oscillating signal with a tunable frequency in the UHF bandwidth. It features a low phase noise of -79dBc (10kHz) and a low source resistance of 10 ohms. Moreover, its double-balanced mixer topology and wide frequency range (up to 77MHz) make it suitable for a variety of applications in wireless communication systems.

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