Home of RF and Wireless Vendors and Resources

One Stop For Your RF and Wireless Need

Advantages of Superheterodyne Receiver | disadvantages of heterodyne Receiver

This page covers Advantages and Disadvantages of Superheterodyne receiver architecture. It mentions benefits or advantages of superheterodyne receiver and drawbacks or disadvantages of superheterodyne receiver.

What is Superheterodyne receiver?

Introduction:
• Heterodyne receiver uses single RF mixer for conversion of modulated RF signal to baseband I/Q signals.
• Superheterodyne receiver uses dual RF mixers for conversion of modulated RF signal to baseband I/Q signals.

Heterodyne and Superheterodyne receiver types use different LO (Local Oscillator) frequency than received signal frequency.

Heterodyne receiver

The figure-1 depicts Heterodyne receiver architecture. Here fIF = fRF - fLO
Refer RF Mixer basics>> and RF Mixer tutorial to understand up conversion and down conversion.

Superheterodyne receiver

The figure-2 depicts Superheterodyne receiver architecture.
Here Here fIF1 = fRF - fLO1 ...equation-1 at stage-I
Here fIF2 = fIF1 - fLO2 ...equation-2 at stage-II
The modulated fIF2 is processed to achieve baseband I/Q signals at zero frequency.
Refer Homodyne Vs Heterodyne Receiver>>.

Benefits or advantages of Superheterodyne Receiver

Following are the benefits or advantages of superheterodyne Receiver and heterodyne receiver architecture types:
➨As it converts high frequency to low frequency, all processing takes place at lower frequencies. The devices are cheaper at such lower frequencies compare to higher frequencies.
➨It is easy to filter IF signal compare to RF signal.
➨It offers better sensitivity compare to homodyne receiver architecture.
➨Heterodyne uses single conversion and Superheterodyne uses double conversion. The Superheterodyne receiver prevents image noise foldover due to use of two IF frequencies before conversion to baseband.

Drawbacks or disadvantages of Superheterodyne Receiver

Following are the disadvantages of superheterodyne Receiver and heterodyne receiver architecture types:
➨It requires additional LOs (Local Oscillators) and RF Mixers to convert signal from RF to IF before conversion to baseband. This increases cost of overall receiver.
➨Moreover filters are also needed to remove any LO leakage as well as undesired frequency components to prevent image frequencies. This also increases cost as well as complexity of the receiver.

Also refer advantages and disadvantages of Homodyne receiver >>.

Advantages and Disadvantages of other wireless technologies

IrDA    HomeRF    Bluetooth    Radar    RF    Wireless    Internet    Mobile Phone    IoT    Solar Energy    Fiber Optic    Microwave    Satellite    GPS    RFID    AM and FM    LTE   

What is Difference between

difference between OFDM and OFDMA
Difference between SC-FDMA and OFDM
Difference between SISO and MIMO
Difference between TDD and FDD
FDMA vs TDMA vs CDMA
FDM vs TDM
CDMA vs GSM

RF and Wireless Terminologies


Share this page

Translate this page