5 GHz Voltage Controlled Oscillations for Frequency Agile RADAR, with Initial Frequency Tuning Capacitor
Zar Khitab1, Farooq Ahmed Bhatti2
1Zar Khitab,  Electrical Engg., Military College of Signals, NUST, Rawalpindi, Pakistan.
2Farooq Ahmed Bhatti,  Electrical Engg, Military College of Signals, NUST, Rawalpindi, Pakistan.
Manuscript received on September 20, 2014. | Revised Manuscript received on October 05, 2014. | Manuscript published on October 30, 2014. | PP: 19-22  | Volume-4 Issue-1, October 2014. | Retrieval Number:  A3431104114/2013©BEIESP

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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: This Paper presents voltage controlled oscillator at 5GHz, 300 MHz bandwidth, and up to 50 kHz wide pulse repetition frequency, for pulse to pulse frequency agile radar. Negative-resistance method with initial frequency tuning capacitor is used in design. The frequency tuning is based on resonant capacitance for varying controlled voltage. The oscillator peak out power is 7.7 dBm, minimum output power in 300 MHz range is 6.997 dBm. First harmonic have power -7.793 dBm. Peak voltage deviation of 12249mV occurs for 34.025 MHz band. The proposed oscillator satisfies standard requirements to generate oscillation frequency for wide band radar systems. Suppressed harmonics and lesser variation in output power throughout 300MHz chip enhances the receive sensitivity of RADAR.
Keywords:  Frequency agile radar, Harmonics, Output power variation, Voltage Controlled Oscillator.