Lo vì mất “gốc”! ppt

... Lo vì mất “gốc”! Chỉ vì rụng tóc! Không rầu sao được, không nói chi đến chuyện cái răng cái tóc là gốc con ... nhiều ông siêng đến thanh nữ hớt tóc không hẳn vì tóc quá dài. Tốc độ tăng trưởng của tóc khó thay đổi cho dù gia chủ có chạy theo đủ lo i quảng cáo vì cơ thể không đào đâu ra chất sừng và nội ... Tóc người da đen dày hơn tóc người da trắng, trung bình khoảng 0,1...

Ngày tải lên: 18/06/2014, 13:20

... systems High peak and average power, reliable, low power supply, low cost BARITT Local oscillators in communication and radar receivers Low power supply, low cost, low noise, reliable Figure 1.3 Microwave ... radar systems, such as traf®c control Low power supply (12 V), low cost, lightweight, reliable, low noise, high gain IMPATT Transmitters for mm-wave communication Low power supply, low c...

Ngày tải lên: 15/12/2013, 11:15

... design frequency. Plot (a) in Figure 5.6 corresponds to design A (that requires a shorter stub closer to the load) while plot (b) represents design B (a longer stub and away from the load). At the ... the position closest to the load and the length of the stub using a Smith chart. 1. In this example, it will be easier to determine the normalized load admittance directly, as follows.  Y L  1...

Ngày tải lên: 15/12/2013, 11:15

... summarized below may be used as well. Exact formulation of the multisection impedance transformer is conveniently developed via the power loss ratio, P LR , de®ned as follows: P LR  Power loss ratio ... therefore, its rb` characteristic has identical lobes. Thus, the heights of intervening lobes decrease at the cost of the main lobe when zeros are moved closer together. On the other hand,...

Ngày tải lên: 15/12/2013, 11:15

... the following two-port network: 3. Determine the Z-parameters of the following two-port network operating at 800 MHz. 4. Determine the Z-matrix for the following two-port network. 5. The following ... S 21 because the network is reciprocal. Further, this network is lossless. Hence, its scattering matrix must be unitary. It can be veri®ed as follows: jS 11 j 2 jS 21 j 2 0:74536 2 0:66666...

Ngày tải lên: 24/12/2013, 17:15

... insertion loss of a Chebyshev ®lter is found as follows: L À20 log 10 1  1  BT 2 m o o c  s 2 6 6 6 6 4 3 7 7 7 7 5  10 log 10 1  BT 2 m o o c  or, L  10 log 10 1 ... 10 L c 10 À 1  10 0:3 À 1  1 And from (8.2.9) we have n  1 2 Â log 10 10 L 10 À 1  log 10 o o c   log 10 B  0:5 Â log 10 10 1:5 À 1 log 10 1:3  6:52 Therefore, 7 elements wi...

Ngày tải lên: 24/12/2013, 17:15

... OSCILLATORS 493 Phase-Locked Loop Terminology Hold-in Range: This is also called the lock range, the tracking range, or the synchronization range. If reference frequency f r is slowly changed from ... N B , in loop B ranges as follows: 5 N B 495 Loops A and B use same reference frequency, and therefore, they have the same response time. It is on the order of 250 msec. On the other hand, loop...

Ngày tải lên: 24/12/2013, 17:15

Ngày tải lên: 12/12/2013, 19:16

... mi- crostrip CQ filter. (a) (b) loss L R = 20 log|S 11 | in dB, and n is the degree of the filter. It is obvious that ⍀ = ±⍀ a (⍀ a > 1) are the frequency locations of a pair of attenuation ... the complex frequency variable of the lowpass prototype filter, and Y e (p) and Y o (p) are the input admittance of the even- and odd-mode forms of the lowpass prototype network, as shown in ... sym...

Ngày tải lên: 15/12/2013, 06:15