In this blog we will discuss about the challenges faced in designing RF transmitters, focusing on direct conversion transmitters. I/Q mismatch What is an I/Q mismatch? We have already discussed this before in receiver blogs and read about I/Q mismatch. …
Introduction to Direct Conversion Transmitter Similar to direct conversion receivers we have direct conversion transmitters. When we are receiving RF modulated signal we are trying to translate it to baseband frequency we call it direct down conversion. Similarly, we have …
Amplitude Modulation RF signal utilizes the signal called carrier signals. In simple language it is just an AC signal at a set frequency, in other words, think of it as a link that connects the communication points. AC signals generate …
In this blog section, we will talk about transmitters and their different architectures. We have now finished our receiver blogs check them out RF system design of Receivers. We will be introducing the main blocks of the transmitter, Let’s start …
From a previous blog about low IF receiver we know that it has an image problem as it’s not zero IF anymore so the signal won’t be translated around the baseband so we will have an image problem. In order …
Low IF Receivers So far, we have discussed different kinds of receivers in our blogs, we talked about IF and zero IF receivers in intermediate or baseband however, we never discussed low IF receivers. Meaning we have the same IF …
Structure of a Dual-Band Receiver The structure shown below is a very interesting structure called the Dual Band receiver which has a dual-band filter and dual-band LNA. It means the filter has two bands, f1 to f2 and f3 to …
Drawbacks of Weaver Architecture The previous blog discussed about the weaver architecture for image rejection. Like Hartley receiver, weaver architecture also has some drawbacks. Secondary image Mixing Spurs The first drawback is the secondary image if the second IF is …
Weaver Receiver Architecture In this blog, we will discuss about Weaver Architecture. This structure is used for image rejection. Previously we discussed about Image rejection using Hartley Architecture. Weaver architecture is similar to Hartley Receiver, this structure uses quadrature down …
Image rejection using Hartley Architecture This blog talks about how Hartley architecture uses 90-degree phase shift and quadrature down conversion to remove the image. In previous blogs, we discussed about 90˚ phase shift, Quadrature down conversion, and image problems. Hartley …