*Lecture 3 Oscillator Introduction of Oscillator Linear Oscillator Wien Bridge Oscillator RC Phase-Shift Oscillator LC Oscillator Stability Oscillators Oscillation: an ...*

*... The magnitude of the loop gain AB must be 1 The phase shift of the loop gain AB must be 180, or 180 plus an integer multiple of 360 RC or phase-shift oscillator ...*

*Demonstrated three oscillator circuits: Wien Bridge oscillator Phase Shift oscillator ... input is to inverting terminal and another 180o from the RC ...*

*Applications An application showing how the phase-shift network is useful is the phase-shift oscillator, which uses a combination of RC networks to produce the required ...*

*At some frequency the phase shift introduced by the RC network will be precisely 180 ... Phase-shift Oscillator A typical phase-shift oscillator is shown below. Here a ...*

*Figure 10-60 (a) An RC low-pass filter and (b) the step response ... Figure 10-76 A Wien-Bridge oscillator. Figure 10-81 A phase shift oscillator.*

*The output of the carrier oscillator is fed to a phase modulator where the phase shift is made to vary in ... Figure 6-11: RC phase-shifter basics. Figure 6-12: A ...*

*These signals phase modulate the oscillator because of the relatively poor ... The phase-shift network usually uses an RC network, sometimes a three stage RC shifter ...*

*... is a negative feedback system where an oscillator-generated signal is phase ... 20db/dec magnitude loss and -90° phase shift ... Min C2 BW set by Tref Cap BW ~ 1/RC ~ 1/L2 ...*

*Oscillator * * Phase Noise We consider a unit bandwidth at an ... CR The advantage is its simplicity I Q * * RC ... the bias current leads to precise 90°-phase shift ...*

*... Diagonal Clipping/distortion in AM Demodulation – RC too large cos C t DSB-SC signal local oscillator ... Shift Keying (ASK) Frequency Shift Keying (FSK) Phase Shift ...*

*... Demodulation Synchronous (Coherent) Local Oscillator ... The 'RC' combination acts as a 'smoothing circuit ... PSK 4 level PSK is also called QPSK (Quadrature Phase Shift ...*

** Voltage controlled oscillator A voltage controlled ... Active Filters Active filters use op-amp(s) and RC ... cont’d) Bandwidth of a filter: BW = fcu - fcl Phase shift ...*

*... 2QLy Loss = GR = YR Loaded Q = QL Noise Ga, fa Thermal Flicker of Phase The Oscillator df/f must shift ... phase fluctuations about carrier SI(f)=I2 V(f) R C - + G=-1 t = RC ...*

*... 0 0 Demodulation requires a local oscillator at the receiver and the frequency and phase ... Design RC for envelope detection. AM ... Phase shift method using Hilbert ...*

*... portion of clock period in high speed circuits RC ... loss J. Wood, et al., “Rotary Traveling-Wave Oscillator ... caused by source Vsj independently Φ : Initial phase shift ...*

** RC(f) t T/2 -T/2 1 rc(t) f T 1/T -1 ... This is “continuous phase form of FSK i.e. CPFSK. 2. “Switched oscillator” method ... Phase shift keying (PSK) A binary PSK ...*

*... Time delay t0 is related to the phase shift and ... 63) Figure 1.13 Realizable Filters Phase characteristic of RC ... transducer, amplifier, modulator, oscillator, power ...*

** To minimize oscillator phase noise generation ... noise x For parallel RC ... criterion: * Ring Oscillator Operation VA VB VC tp tp tp Total phase shift in loop ...*

*... are the best choice QCA Two-Stage Shift Register Two latches with two electrometers Coupling by means of Capacitors Two-phase ... and (for heterodyne mixing) local oscillator ...*

*It consists of a precision comparator, a shift ... TTl based square wave crystal oscillator RC Oscillators ... with respect to the input (180 out of phase). The ...*

*... Mbps) Band 2400-2483.5 MHz GFSK (Gaussian Frequency Shift ... 3π/2 10 π 11 π/2 01 0 00 Phase Dibit pattern (di,d(i+1 ... 30dBr -50dBr Spectral Masking Comparing Sinc with RC ...*

*... Direct Conversion CMOS Receivers Local Oscillator Generation Low phase ... For correct regeneration the loop phase shift is ... pairs for low 1/f noise Multi-mode RC load ...*

*http://www.eng.fsu.edu/~mpf EEL 4930 (§6) & 5930 (§5), Spring 2006 Physical Limits of Computing Slides for a course taught by Dr. Michael P. Frank*

*Isotope shift of the K(alpha 1) x-ray in uranium ... The measurement of oscillator strengths in the presence of ... Signal Delay in General RC Networks with Application ...*