Electronics & Communication

Implications of Nanotechnology

The fields in which the implication of nanotechnology extends are numerous. Some of the most common fields are computing, engineering, biology, chemical, communications, material science different systems and many more. Through nanotechnology, there are a lot of benefits and improvements in a various field of [...]

Latest Research on Nanotechnology

Nanotechnology – Latest Research In this article, the latest research that is being undergone in the field of nanotechnology is explained in detail. Many kinds of researches and approaches are taking place in the field of nanotechnology. Some of the basic approaches are explained below. Before going [...]

Nanoelectronics

Nanoelectronics Nanoelectronics are based on the application of nanotechnology in the field of electronics and electronic components. Although the term Nanoelectronics may generally mean all the electronic components, special attention is given in the case of transistors. These transistors have a size lesser than 100 [...]

Receiver Intermodulation and Dynamic Range

Receiver Intermodulation and Dynamic Range On the opposite end from small signals (i.e., those near the noise floor), strongly received signals can also limit the performance of receivers. Isn’t this statement paradoxical? On the contrary: as we’ll see in this lecture, two strong signals that [...]

Nyquist Noise Formula Cascading Noisy Components Noise Figure

Nyquist Noise Formula Cascading Noisy Components Noise Figure Due to thermal agitation of charges in resistors, attenuators, mixers, etc., such devices produce noise voltages and currents. For example, in a resistor the charges move randomly due to thermal agitation: As you know, applying a voltage across [...]

Decreasing Channel Bandwidth by Using CW Key Clicks

Decreasing Channel Bandwidth by Using CW Key Clicks The text has previously mentioned that it’s important for the transmitter not to turn on or off too quickly. For example, C56 in the Driver Amplifier is used to gradually turn off the transmitter: In this lecture, we [...]

Variable Frequency Oscillator Gain Limiting

Variable Frequency Oscillator Gain Limiting The VFO is one of the main subsystems in a transceiver. It sets the operating frequency for both reception and transmission. In order to “tune” to other frequencies, we actually change the frequency of this variable frequency oscillator. Two general [...]

Superheterodyne Receivers Spurious Responses of Mixers

Superheterodyne Receivers Spurious Responses of Mixers Recall from that a direct conversion receiver has the following simplified system diagram: The frequencies internal to the direct conversion receiver are: From the last lecture, we can now understand that while f+ and fare the intended output signals, other frequency [...]