Showing papers by "Agilent Technologies published in 1987"
TL;DR: This presentation describes some atypical types of silica-based particles with unique separation properties that enlarge the capabilities of HPLC methods.
95 citations
Patent•
30 May 19873 citations
Patent•
29 Sep 1987TL;DR: In this article, the carrier signal and its sideband noise components are attenuated below the equivalent thermal noise floor of an attenuator and then amplified in an amplifier having a known noise figure to produce a composite carrier signal having a usable power level and a precisely known signal to noise ratio.
Abstract: A signal source which provides a carrier signal having a precisely set signal-to-noise ratio is provided. The carrier signal and its sideband noise components are attenuated below the equivalent thermal noise floor of an attenuator. The attenuated carrier signal and the equivalent thermal noise floor are then amplified in an amplifier having a known noise figure to produce a composite carrier signal having a usable power level and a precisely known signal-to-noise ratio. Since the equivalent thermal noise floor is a function only of temperature, the desired carrier signal-to-noise ratio may he set by setting the power level of the carrier signal and knowing the noise figure of the amplifier. Case 187021
1 citations
Patent•
24 Mar 1987TL;DR: In this article, a bandpass filter relies on feedforward (as opposed to feedback) to compensate for losses within the band-pass filter and two feedforward circuits are shown, one a current source and the other a voltage source in series with a resistance.
Abstract: A bandpass filter is presented which allows variation of bandwidth while passband gain remains constant. The presented bandpass filter relies on feedforward (as opposed to feedback) to compensate for losses within the bandpass filter. Two feedforward circuits are shown, one a current source and the other a voltage source in series with a resistance.