CARACTERÍSTICAS

Dual output frequency range

fOUT = 12.92 GHz to 14.07 GHz

fOUT/2 = 6.46 GHz to 7.035 GHz

Output power (POUT): 11.5 dBm

SSB phase noise: −113 dBc/Hz at 100 kHz

No external resonator needed

RoHS compliant, 5 mm × 5 mm, 32-lead LFCSP: 25 mm²

 

APLICACIONES

Point to point and multipoint radios

Test equipment and industrial controls

Very small aperture terminals (VSATs)

 

DESCRIPCIÓN GENERAL

The HMC1169 is a monolithic microwave integrated circuit (MMIC), voltage controlled oscillator (VCO) that integrates a resonator, a negative resistance device, and a varactor diode, and features a half frequency output.

Because of the monolithic construction of the oscillator, the output power and phase noise performance are excellent over temperature. The output power is 11.5 dBm typical from a 5 V supply voltage. The VCO is housed in a RoHS compliant LFCSP and requires no external matching components.

 

MORE APPLICATION DESCRIPTIONS

TEORÍA DE FUNCIONAMIENTO

THEORY OF OPERATION The HMC1169 voltage controlled oscillator is a free running voltage controlled frequency source. The output frequency is controlled by applying a variable tune voltage to the VTUNE port. Because VTUNE is varied from the lowest to the highest allowed voltage, the VCO output frequency increases from the lowest to the highest operating frequency. This VCO output frequency change with the applied VTUNE input results in the VCO frequency sensitivity characteristic (MHz/V). The VCO frequency sensitivity is not constant and varies across the tunable range.

The HMC1169 VCO is specified to cover the minimum to maximum frequencies specified in this data sheet over the entire specified temperature range, including the VCO frequency drift (MHz/°C). In addition, for low phase noise operation, drive the VTUNE port from a low noise voltage source. Excessive noise on the VTUNE port results in poor phase noise performance. The tune port modulation bandwidth is typically greater than 10 MHz.

To achieve optimum VCO phase noise performance when using the HMC1169, it is important to use a low noise power supply for VCC biasing. Because the VCO output frequency changes with small changes in the VCC bias voltage (pushing), noise on the VCC bias pin results in increased phase noise. Take care to use low noise regulators, otherwise, bias line noise may corrupt the low phase noise output of the HMC1169.

Internally, the radio frequency (RF) output frequency is generated from a doubler circuit. This generation results in an unwanted low level output signal present at half the RFOUT frequency (RFOUT/2). If necessary, this undesired spurious signal can be further filtered on the customer application board using a filter. The RFOUT/2 output signal is available directly at the RFOUT/2 port. The RFOUT/2 port commonly drives a phase-locked loop (PLL) synthesizer for phase locking the HMC1169 output if needed.

Lastly, the HMC1169 RFOUT port incorporates an internal buffer amplifier to provide good output matching. The internal buffer amplifier also isolates the VCO core from the output load and minimizes the VCO frequency change with the changes to the output load impedance (pulling).

INFORMACIÓN SOBRE APLICACIONES

The HMC1169 serves as the local oscillator (LO) in microwave synthesizer applications. The primary applications are point to point microwave radios, military, radars, test and measurement, as well as industrial and medical equipment. The low phase noise allows higher orders of modulation and offers improved bit error rates in communication systems, whereas the linear,monotonic tuning sensitivity allows a stable loop filter design. The higher output power minimizes the gain required to drive subsequent stages. The half frequency output reduces the input frequency to the prescaler without the addition of residual phase noise to the input of the phase-locked loop synthesizer.

EVALUATION PRINTED CIRCUIT BOARD (PCB)

The circuit board used in an application uses RF circuit design techniques. Ensure that the signal lines have 50 Ω impedance and that the package ground leads and backside ground paddle are connected directly to the ground plane. Use a sufficient number of via holes to connect the top and bottom ground planes.