Quantcast
Transformer Coupling

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Custom Search
 
  
 
1-13 Figure 1-11 shows an impedance-coupling network between two stages of amplification. L1 is the load for Q1 and develops the output signal of the first stage. Since the d.c. resistance of a coil is low, the efficiency of the amplifier stage is increased. The amount of signal developed in the output of the stage depends on the inductive reactance of L1. Remember the formula for inductive reactance: Figure 1-11.—Impedance-coupled transistor amplifier. The formula shows that for inductive reactance to be large, either inductance or frequency or both must be high. Therefore, load inductors should have relatively large amounts of inductance and are most effective at high frequencies. This explains why impedance coupling is usually not used for audio amplifiers. The rest of the coupling network (C1 and R1) functions just as their counterparts (C1 and R2) in the RC-coupling network. C1 couples the signal between stages while blocking the d.c. and R1 develops the input signal to the second stage (Q2). Transformer Coupling Figure 1-12 shows a transformer-coupling network between two stages of amplification. The transformer action of T1 couples the signal from the first stage to the second stage. In figure 1-12, the primary of T1 acts as the load for the first stage (Q1) and the secondary of T1 acts as the developing impedance for the second stage (Q2). No capacitor is needed because transformer action couples the signal between the primary and secondary of T1.


Electrical News
Naptech Offers Free Calibrations for 5 Years
Just ship any repaired test equipment back once a year....
eetimes.com
EEVblog #605 – Fig.8 & Cardioid Microphone Patterns
Doug Ford, former head designer from Rode Microphones continues with...
eevblog.com
Hubble Turns 24: 5 Biggest Discoveries
The Hubble Space Telescope has helped solve huge questions about...
eetimes.com
Samsung Defense: Marketing Guru vs. Marketing Guru
Parade of marketing and programming experts continues as Samsung tries...
eetimes.com
IoT: A Return to Our Favorite EDA Requirements
For the electronic design automation (EDA) industry, the Internet of...
eetimes.com
Life Without DropBox? Unthinkable!
Once you've installed the DropBox app on your computers, anytime...
eetimes.com
New IC for Driverless LEDs
A Eurolighting module produces flicker-free LED light from 230 VAC....
eetimes.com
SanDisk Finds Profit Behind the Tech Curve
Focus and frugality put SanDisk in several sweet spots in...
eetimes.com
Will 'Makers' Help Chip Guys' Bottom Line?
Are you seeing this newborn love among "makers," board vendors,...
eetimes.com
Where Are DRAM Interfaces Headed?
What comes after today's fastest interfaces? Jim Handy talks about...
eetimes.com
IoT Requires Continuous Development
The Internet of Things will add so much programmability to...
eetimes.com
AMD Narrows Its Losses in Q1
As sales of PC continue to decline, AMD is looking...
eetimes.com
Quantum-Dot Windows Harvest Solar Energy
The windows of the future could harvest the sunlight passing...
eetimes.com
Patent Lessons From Apple v. Samsung
The Apple v. Samsung case exposes vast gray areas in...
eetimes.com
Fitness Wearables Lack Accuracy
A new generation of wearable fitness sensors is needed to...
eetimes.com
Bagels: Official Food of Test & Measurement
A bagel is the perfect food to eat at your...
eetimes.com
Max's BADASS Display, Part 3
Now we come to consider the various ways in which...
eetimes.com
Smartphones, 28nm Tech Drive TSMC 1Q Revenue
Thanks to demand for high-end smartphones and investment in technology...
eetimes.com
Quantenna Speeds Up WiFi
As several major companies roll out 802.11ac solutions with multi-user,...
eetimes.com
Samsung Patent Leaks Point to Google Glass Competitor
In a series of leaked patent documents from South Korea,...
eetimes.com
   


Privacy Statement - Copyright Information. - Contact Us

comments powered by Disqus

Integrated Publishing, Inc.
9438 US Hwy 19N #311 Port Richey, FL 34668

Phone For Parts Inquiries: (727) 755-3260
Google +