好不容易装好了15.7，有些小意见，提一下。
叠层图还真的没看见，只有钻孔表
布局：晶体最好不要放在板边，容易产生干扰。0402的阻容元件有的靠的非常近，不利于焊接。usb连接器焊盘与24c02太近
好像还有两个board outline
布线：有部分走线穿过晶体；连通率还不到100%；阻抗线width不一致，走了重复的路径，造成宽度变化
射频部分是否需要追加地过孔
铺铜还有碎铜皮。 地分割我看得不是太清楚，觉得重合的区域比较多，应该还有改进的地方。
design name f:/资料/vna/vna080419_haisens/vna080419.brd
date mon may 05 15
16 2008
drawing statistics:
drawing extents xl(0.0000) yl(0.0000) xu(863.6000) yu(558.8000)
dimensions in millimeters with 4 decimal places
package symbols: total(144) mirrored(0) pins(574)
mechanical symbols: total(0) mirrored(0) pins(0)
format symbols: total(0)
drc state: up to date
drc errors: 726
waived drc: 0
padstack definitions: 29
functions: assigned(145) unassigned(0) total(145)
--------------------------------------------------------------------------------
layout statistics:
components: placed(144) unplaced(0) total(144)
nets: w/rats(164) no/rats(0) total(164)
pins: w/rats(528) no/rats(0) unused(42) unplaced(0) total(570)
equivalent ics (1 pin = 1/14 eic): 40
ratts: 0
router keepin (in): (0.0000,0.0000) by (0.0000,0.0000)
layout area (sq in): 0.00
layout density (sq in/eic): 0.000
pin density (pins/sq in): 0.000
double-sided layout area (sq in): 0.00
double-sided layout density (sq in/eic): 0.000
double-sided pin density (pins/sq in): 0.000
average ratlength (in): 0.2
rat density (in/sq in): 0.000
double-sided rat density (in/sq in): 0.000
--------------------------------------------------------------------------------
connection statistics:
connections: w/rats(365) no/rats(0) total(365)
already connected: w/rats(361) no/rats(0) total(361)
missing connections: w/rats(4) no/rats(0) total(4)
dangling connections (see logfile): 54
connection completion: w/rats(98.90%) no/rats(0.00%) total(98.90%)
manh distance (inches): 72.1642
etch length (inches): w/rats(61.81) no/rats(0.00) total(61.81)
number of vias: w/rats(198) no/rats(0) total(198)
vias per connection: w/rats(0.55) no/rats(0.00)total(0.55)
smd pins with attached clines: 421
--------------------------------------------------------------------------------
etch statistics:
layer clines/carcs shapes(voids) rectangles lines/arcs text
top 639 31(52) 0 0 0
m1 21 1(114) 0 0 0
m2 7 4(122) 0 0 0
bottom 33 0(0) 0 0 0
