What is a phase interpolator?
The phase interpolator is a critical circuit in the receiver of the serial link. It allows the receiver to adjust the phase of its sampling clocks in very fine increments. Four equally spaced clocks are generated and fed into a 4:2 multiplexer.
What is interpolation in signal processing?
In the domain of digital signal processing, the term interpolation refers to the process of converting a sampled digital signal (such as a sampled audio signal) to that of a higher sampling rate (Upsampling) using various digital filtering techniques (for example, convolution with a frequency-limited impulse signal).
What are the applications of interpolation in dsp?
Applications of interpolators include conversion of a discrete-time signal to a continuous- time signal, sampling rate conversion in multirate communication systems, low-bit-rate speech coding, up-sampling of a signal for improved graphical representation, and restoration of a sequence of samples irrevocably distorted …
What is interpolation in history?
An interpolation, in relation to literature and especially ancient manuscripts, is an entry or passage in a text that was not written by the original author.
How clock and data recovery works?
How does CDR work? It locks on a frequency that is retrieved from incoming data stream. To do so, it detects the data transitions and locks an VCO (Voltage Controlled Oscillator) to that frequency. It matches the phase of the clock, already recovered in frequency detection, with the incoming data bit stream.
What is interpolator DSP?
Description. The dsp. Interpolator System object™ interpolates values between real-valued input samples using linear or polyphase FIR interpolation. Specify which values to interpolate by providing a vector of interpolation points. An interpolation point of 1 refers to the first sample in the input.
What is ideal interpolator?
Ideal interpolation is, by definition, given by a linear projector on the space Π of polynomials whose kernel is a polynomial ideal. It is therefore also any linear map, as used in algebra, that associates a polynomial with its normal form with respect to a polynomial ideal.
Who discovered interpolation?
Brahmagupta’s interpolation formula is a second-order polynomial interpolation formula developed by the Indian mathematician and astronomer Brahmagupta (598–668 CE) in the early 7th century CE.
Who created interpolation?
1670: In a letter to Collins, dated November 23, 1670, Gregory describes the now well-known Gregory-Newton interpolation formula for equal-interval data. 1675: Newton begins his fundamental work on the topic and eventually lays the foundation of classical interpolation theory.
What is CDR in optics?
An optical clock and data recovery circuit (CDR) is connected to the optical transceiver on the end of a fibre channel link to extract timing information from a serial data stream to allow the receiving circuit to decode the transmitted data.
What are CDR circuits?
Digital clock and recovery circuits (CDRs) have recently emerged as an alternative to their more classical analog counterparts. The jitter performance metrics such as jitter generation, jitter transfer, and jitter tolerance are related to digital CDR parameters and design guidelines are provided.
Which one is the spectrum of an interpolator?
The question is, what is the spectrum of this continuous time signal? The intuition is that given that the sinc is the prototypical band limited function, the spectrum of the interpolated function will be itself band limited.
What is a current-controlled phase interpolator?
It allows the receiver to adjust the phase of its sampling clocks in very fine increments.We chose to implement a current-controlled phase interpolator, as described in [Sid97] rather than a voltage-controlled interpolator, as described in [Enam92].
What is the difference between reference loop and phase interpolator?
Lastly, although the reference loop can occupy the majority of the area and dissipate the majority of the power in a phase interpolator based CDR, its reference phases can be shared among several CDR loops on chips receiving multiple data signals.
What is phase interpolator-based CDR (cdr)?
A phase interpolator based clock-data recovery circuit (CDR) is an alternative circuit architecture developed by Rambus which provides multiple advantages compared to PLL-based CDRs. What is Phase Interpolator-Based CDR Technology?
What is the range of the phase interpolator?
Therefore, the four inputs to the phase interpolator will be spaced by a total of 1.5 ns. Since the data eye is only 1 ns wide, the range of the phase interpolator is 0.5 ns larger than necessary. This is important because the delay elements in the DLL and the interpolator may not be precisely matched since their loads may differ slightly.