phase

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Transmit spectrum with phase noise

by Krishna Sankar on August 28, 2012

spectrum_plot_phase_noise

The earlier posts on phase noise discussed about phase noise in oscillators, conversion of phase noise profile to jitter and the impact of phase noise on the error vector magnitude (evm). This post discuss the [...]

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EVM with phase noise

by Krishna Sankar on July 9, 2012

constellation_plot_phase_noise_esn0

The previous post on phase noise discussed about finding the root mean square phase noise for a given phase noise profile. In this post let us discuss about the impact of phase noise on the [...]

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Phase noise power spectral density to Jitter

by Krishna Sankar on June 22, 2012

power_spectral_density_oscillator_phase_noise

Following a brief discussion with my friend Mr. Rethnakaran Pulikkoonattu on phase noise profiles, he pointed me to his write up on Oscillator Phase Noise and Sampling Clock Jitter . In this post, we will discuss the math behind integrating [...]

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Oscillator phase noise

by Krishna Sankar on June 8, 2012

oscillator_lorentzian_spectrum

Oscillators are used in typical radio circuits to drive the mixer used for the up-conversion or down-conversion of the passband transmission. Ideally, the spectrum of the oscillator is expected to have an impulse at the [...]

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Using CORDIC for phase and magnitude computation

by Krishna Sankar on December 16, 2007

Flow chart for the operations involved when CORDIC is used for phase and magnitude computation

In a previous post (here), we looked at using CORDIC (Co-ordinate Rotation by DIgital Computer) for understanding how a complex number can be rotated by an angle without using actual multipliers. Let us know try [...]

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CORDIC for phase rotation

by Krishna Sankar on August 19, 2007

cordic_thetahat_phase_convergence

My understanding of the CORDIC (Co-ordinate Rotation by DIgital Computer) thanks to the nice article in [DSPGURU-CORDIC].

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First order digital PLL for tracking constant phase offset

by Krishna Sankar on June 10, 2007

first_order_pll

Considering a typical scenario where there might exist a small phase offset between local oscillator between the transmitter and receiver. Figure 1 : Transmitter receiver with constant phase offset In such cases, it might be desirable [...]

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