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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Su Cui Banerjee, B. Acharya, V. |
| Copyright Year | 2012 |
| Description | Author affiliation: Broadcom, Irvine CA 92627, USA (Su Cui; Banerjee, B.; Acharya, V.) |
| Abstract | Measurement results of a linear current-controlled oscillator (CCO) is presented. Output frequency of a ring oscillator is sensed by a linear CMOS switched-capacitor frequency-detector (SCFD) that operates well over the frequency range of the oscillator operation. The feedback is completed by controlling the supply current of the ring oscillator using a negative impedance converter(NIC). This simple low-power circuit does not use operational amplifiers or resistors. The linearization technique is applicable to all types of oscillators. A prototype of this CCO is fabricated in TSMC 0.18µm CMOS process and it has a power consumption less than 3.6 mW in the frequency range of 140 MHz to 1.15 GHz from a supply voltage of 1.8 V. The measured phase noise is −93.44 dBc/Hz at 1 MHz offset from the carrier at the frequency of 501.13 MHz. It achieves 0.12% linearity over the entire tuning range. This CCO can be readily used in ultra-low power wideband and cognitive radios. A method of improving the settling time by a simple circuit modification of the frequency-detector is discussed with supporting post-layout simulation results. |
| Starting Page | 146 |
| Ending Page | 149 |
| File Size | 681575 |
| Page Count | 4 |
| File Format | |
| ISBN | 9781467325264 |
| ISSN | 15483746 |
| e-ISBN | 9781467325271 |
| e-ISBN | 9781467325257 |
| DOI | 10.1109/MWSCAS.2012.6291978 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2012-08-05 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Voltage-controlled oscillators Tuning Phase noise Current measurement Power demand Wireless communication |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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