Author(s): Nadgir, A; Thurston, R; Larsen, KA; Shivaram, N; Brister, MM; Slaughter, DS | Abstract: We describe a software implementation of multi-channel, multi-frequency Lock-in Amplifier (SILIA) to extract modulated signals from noisy data distributed over multiple channels arbitrary number and size. This emulates the functionality lock-in amplifier in post-processing step following acquisiti...

In this work, we analyze the effects of an inter-stage capacitor located between the power stage input and the driver stage output on the overall efficiency of a RF CMOS power amplifier and on gate-drain reliability problems. To verify the analyzed effects, we designed a RF CMOS power amplifier with a center frequency of 1.85GHz. Class-D amplifiers with a feedback resistor are used as driver st...

We demonstrate optical packet clock recovery with locking in less than 700 ps (25 bits) using a novel device which is compatible with other monolithic components. Regenerative capabilities are analyzed using bit

A method for reducing the two-tone third-order intermodulation products arising from two carrier frequencies at 1.95 and 2.00 GHz is demonstrated in a traveling wave tube-distributed amplifier. The optimum amplitude and phase of an injected second harmonic and the resulting intermodulation suppression of up to 24.2 dB are examined for fundamental drive levels approaching saturation.

The use of so-called “composite left/right-handed transmission lines” in the design of distributed amplifiers is discussed using a simple model for the active device. The simplified analysis performed herein shows that it is possible to modify the frequency response of forward and reverse power gains, a significant development which could lead to innovative distributed amplifier designs. © 2006...

This paper presents a new negative resistance (NR) network which is designed to compensate losses in a distributed amplifier (CDA). The byproduct of the new NR network in the CDA is significant improvement of bandwidth (~20%). The simplicity of the NR network makes it amenable to MMIC technology and for other applications too.

A novel structure that encodes and decodes very high speed unipolar Code Division Multiple Access (CDMA) signals is proposed. This scheme is based on the analogy between the distributed amplifier and the transversal filter. By adjusting the gain of each tap and the delay between taps, the proposed device acts as a high-speed encoder (transmitter) or correlator (receiver). The theoretical analys...

The level of deoxyadenylate (da) regions in human DNA was estimated from formation of poly(U)-poly(da) triplexes on nitrocellulose filters that were RNAase resistant. The (dA) rich sequences were determined following mild ribonuclease treatment of the poly(U)-DNA hybrids (5 mug/ml at 25 degreesC for 30 min), where as exhaustive ribonuclease treatment (5 mug/ml at 25 degrees C for 6 hr) estimate...