Signal Processing Group

Signal Processing Group Inc. has been a trusted provider of innovative, cost-effective analog and mixed-signal solutions since 1988. Signal Processing Group specializes in delivering:

Low-risk, high-reliability services for integrated circuits
Wireless ASICs
Custom modules
PCB-based analog and wirelessproducts

Our Services and Products

ASICS or application specific integrated circuits are a very useful class of semiconductor product that allows the engineer or manager to precisely specify an application or function and order the device from a design house. Preferably from our company Signal Processing Group Inc.

Recent Blog Posts

TD — transmission line delay conversion to a physical length

SPICE type CAD tools usually specify ideal transmission lines using the TD parameter. TD is the associated time delay of a signal transiting through a section of an ideal transmission line. However, sometimes it is easier to think in terms of physical length of the T-line. A calculator that does this is available from Signal Processing Group at the “calculators” menu item. Please visit that as well as a list of other calculators ( slanted towards RF/analog and microwave/mmWave design ) at the “calculators” menu item

Calculate the reactance of an inductor.

ACalculating the reactance of an inductance is simple but fraught with reiterations. Signal Processing Group has released a calculator that does this given the inductance value and the frequency of operation. This calculator can be found in the SPG website under the “calculators” menu.

A calculator for the reactance of a capacitor, given the capacitor value and the frequency.

This calculation is a very common calculation in the design of many circuits, integrated and otherwise. Its simple to do it can tedious because of human error. This calculator that is presented by Signal Processing Group simplifies the calculation and allows the user to quickly get the result. Look it up under the calculators menu on the SPG website. https://www.signalpro.biz/calculators/calculators1.html.

A GM-C filter design in CMOS technology

GM-C filters can be very useful when designing in fine line MOS or in a CMOS or BiCMOS technology. The capacitor sizes can be made small and thus save chip area. They can be easier to test. If the prototype filter is designed with lumped L and C components then these can be replaced with solid state blocks such as integrators. GM – C theory is fairly well understood so the risk in design is relatively low. SPG presents a report on a GM-C bandpass filter we did for interested readers ( engineers, students and Instructors) with an earnest hope that it will be useful. Please visit the SPG website and read or download the report.

Horn Antenna

This post describes a methodology for the design of a pyramidal horn antenna. Following posts build on it and provide more details. A pyramidal horn is a popular antenna that has very little loss and is used commonly in antenna systems. The structure of the pyramidal horn is shown in FIGURE 1.0 below.

Calculate the number of turns required for a given value of an inductor using a toroid.

Recently we published a calculator that provides the value of an inductor wound on a toroid given the number of turns of wire and other parameters. A reverse calculator is provided now by SPG that calculates the number of turns needed to generate a given value of an inductor wound on a toroid. Please visit the SPG website and check under the “complementary” menu.

Inductance calculation for a toroidal inductor

The inductance of a toroidal inductor can be calculated using the following simple expression: L = AL*n*n/1000 uH. AL is a constant provided by the manufacturer of the toroid and n is the number of turns of wire.

You Dream It, We Build It