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MOSAID Maestro Digital Frequency Synthesizer PLL Used in WiQuest Ultra-wideband IC
. "The wide frequency range and fractional multiplication of the PLL made it very easy to use." "WiQuest's focus on high bandwidth at low power is key to bringing a commercially viable UWB technology to video and wireless USB applications, " said Peter Gillingham, VP and GM, MOSAID Intellectual Property Division.. "Our cutting-edge low-power fractional PLL moves UWB a giant step closer to reality for these demanding consumer applications." About MOSAID Maestro PLLs The MOSAID Maestro family of PLLs includes delta-sigma fractional-N PLL IP products with an ideal combination of true fractional frequency multiplication and low power, making them ideal for portable electronic, consumer and networking applications.. Key features of the MOSAID Maestro family include a small area (0.04mm 2 ), less than 2mW of power, and a fine-grain frequency multiplication capability that enables the PLLs to accurately output any frequency for most applications.. Additionally, MOSAID Maestro PLL products are fully integrated, highly programmable, feature low jitter and operate over a wide frequency range - up to 3GHz.
Frequency-to-digital convertor aids smart sensors: News from Sensors Web Portal
News Release from: Sensors Web Portal Edited by the Electronicstalk Editorial Team on 27 October 2004 Frequency-to-digital convertor aids smart sensors The UFDC-1 is a programmable, two-channel frequency-to-digital convertor for use with any frequency, period, duty-cycle, time interval, phase-shift and pulse number output.. It’s free! The UFDC-1 is a programmable, two-channel frequency-to-digitalconvertor for use with any frequency, period, duty-cycle, timeinterval, phase-shift and pulse number output.. The UFDC-1converts any frequency-time domain signal to digital and usesfour patented conversion methods.. The UFDC-1 canbe used for any frequency-time domain signal like a standard ADCfor the domain.. The device'sapplications are numerous: from DAQ systems, measuringinstruments (frequency counters, tachometers, DMM) andquasidigital sensors up to one-chip digital sensors design, smart(self-adaptive) sensors and multifunction sensors and systems.
Frequency synthesizer with digital frequency lock loop
A frequency synthesizer with a digital frequency lock loop (FLL) whiсh hаs a fast frequency lock time uses a frequency counter circuit in the feedbаck loop to count the production indicator frequency and create frequency count information.. A microprocessor рrосesses the frequency count information alongside with the moduIation information to give a frequency manage indicator for managing the nominaI, оr middle, frequency of the FLL indicator source.. By рrосessing these information jointly, thus accounting for the quantity of moduIation useful to the FLL indicator source, the middle frequency саn be mаintаined extra time аfter time notwithstanding the рresenсe of moduIation in the feedbаck loop indicator.
CTM: Digital control Tutorial
. [numDz, denDz] = c2dm (num, den, Ts, 'zoh') [F, G, H, J] = c2dm (A, B, C, D, Ts, 'zoh') The sampling time (Ts in sec/sample) should be smaller than 1/(30*BW), where BW is the closed-loop bandwidth frequency.. Transfer function Suppose you have the following continuous transfer function M = 1 kg b = 10 N.s/m k = 20 N/m F(s) = 1 Assuming the closed-loop bandwidth frequency is greater than 1 rad/sec, we will choose the sampling time (Ts) equal to 1/100 sec.. The characteristics in the z-plane can be related to those in the s-plane by the expression T = Sampling time (sec/sample) s = Location in the s-plane z = Location in the z-plane The figure below shows the mapping of lines of constant damping ratio (zeta) and natural frequency (Wn) from the s-plane to the z-plane using the expression shown above.. where zeta = Damping ratio Wn = Natural frequency (rad/sec) Ts = Settling time Tr = Rise time Mp = Maximum overshoot Important: The natural frequency (Wn) in z-plane has the unit of rad/sample, but when you use the equations shown above, the Wn must be in the unit of rad/sec.
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Powell's Books - Digital Frequency Synthesis Demystified with CDROM (Demystified) by Bar-giora Goldberg
. This is book is a comprehensive overview of digital frequency synthesis theory and applications, with a particular emphasis on the latest approaches using fractional-N phase-locked loop technology.
Single Frequency Digital Line Tracer
> > Single Frequency Digital Line Tracer Model TW-7700 The state-of-the-art TW-7700 utilizes advanced digital signal processing for precision locating performance yet is extremely easy to use.
Digital-to-Digital Frequency Transformations
Digital-to-Digital Frequency Transformations By: Note: This browser cannot correctly display MathML.
Digital frequency discriminator - Patent 5828238
. A digital frequency discriminator comprising: a buffer responsive to a sinusoidal RF input signal having a predetermined center frequency with a predetermined period for providing a squarewave output signal having the same frequency as the sinusoidal RF signal; a programmable digital delay line responsive to said squarewave output signal for generating a delayed signal replica of said squarewave output signal, at a predetermined delay .tau.. by shifting said predetermined center frequency by 90 degrees; an exclusive OR gate, responsive to said output signal of said programmable digital delay line and to said squarewave output signal for providing a different output signal comprising an inverted output signal and non-inverted output signal which comprises a series of pulses of width .tau.. Description: BACKGROUND OF THE INVENTION The disclosed invention is directed generally to frequency discriminators, and more particularly to a digital frequency discriminator.. RF frequency discriminator circuits are employed in electronic warfare (EW) systems to detect the frequencies of received RF signals such as the RF signals emitted by enemy radar systems.
Benefits
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Digital | BBC World Service . ^^ > Analogue Radio Medium wave Frequency 648 kHz, which is beamed from Suffolk to Belgium and the Netherlands, can be heard in parts of southeast England and London 24 hours a day.