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Oscillator compensation circuit for 27 mhz

Oscillator compensation circuit for 27 mhz / Chan Yun Huan
Litar pengayun menghasilkan gelombang kotak yang mempunyai frekuensi 27 MHz direka dengan mengguna 50 nm MOSFET bermodel BSIM 4. Pengayun ini dapat menangani tahap suhu dari -25 ̊C hingga 80 ̊ C. Perisian LTspice digunakan untuk mereka litar dan simulasi dijalankan bagi litar ini. Teknik pengimbangan kesan suhu dapat dijanakan melalui arus elektrik yang berkadar dengan suhu mutlak (PTAT) dan arus elektrik pelengkap dengan suhu mutlak (CTAT). Arus elektrik dijanakan dengan aplikasi teknik pengimbangan suhu yang mampu bertahan suhu pada julat -25 ̊C hingga 80 ̊C tanpa gangguan. Litar arus elektrik digunakan sebagai sumber arus elektrik dalam perbezaan pengamplifikasi. Peranan perbezaan pengamplifikasi adalah sebagai pengayun yang dapat menjana gelombang mempunyai frekuansi 27 MHz. Litar sumber arus elektrik merupakan sasaran utama untuk aplikasi teknik pengimbangan suhu. Voltan yang dibekalkan kepada seluruh litar adalah 1V. Litar ini dapat menghasilkan gelombang kotak dengan perubahan frekuensi sebanyak 6.96% dalam julat suhu tersebut. _______________________________________________________________________________________________________ A 27 MHz oscillator circuit is designed by using 50nm MOSFET model BSIM 4. It able to generate 27 MHz square wave. This oscillator able to compensate temperature from -25 ̊ C to 80 ̊ C. LTspice software is used to design and run simulation for this circuit. Temperature compensation technique involved cancellation effect of proportional to absolute temperature (PTAT) current source with effect of complementary to absolute temperature (CTAT) current source. Current references circuit is created from temperature compensation technique which able to withstand for temperature range -25 ̊ C to 80 ̊ C without deviation. The current references circuit is used as tail current for differential amplifier. Role of the differential amplifier is becoming an oscillator which able to generate 27 MHz square waves. Tail current of the differential amplifier is major target to be compensated from temperature which helps to maintain output characteristic of the oscillator. Voltage supplied to whole circuit is 1 V. This circuit is able to produce square wave with maximum frequency variation of 6.96% along the temperature range.
Contributor(s):
Chan Yun Huan - Author
Primary Item Type:
Final Year Project
Identifiers:
Barcode : 00003106996
Accession Number : 875007118
Language:
English
Subject Keywords:
27 MHz oscillator circuit; 50nm MOSFET model BSIM 4; LTspice software
First presented to the public:
6/1/2017
Original Publication Date:
4/23/2018
Previously Published By:
Universiti Sains Malaysia
Place Of Publication:
School of Electrical & Electronic Engineering
Citation:
Extents:
Number of Pages - 63
License Grantor / Date Granted:
  / ( View License )
Date Deposited
2018-04-23 15:29:56.648
Date Last Updated
2019-01-07 11:24:32.9118
Submitter:
Mohd Jasnizam Mohd Salleh

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