带图像的都很复杂。
雷达系统，电视系统，LaserDisc，录放像机。
这些不仅是电路复杂， 成本重点还都是精密的特种部件，天线，显像管，机芯，线性的光学磁学部件等。

的确，最复杂的是图像处理电路！雷达电路很复杂吗？

引用 分立元件:
的确，最复杂的是图像处理电路！雷达电路很复杂吗？

图像处理电路不算复杂，现在的图像处理大部分都数字化了，普通雷达电路不能叫做复杂，但是各种技术要求很高，各种射频方面的要求，而且还牵涉到非常大功率的射频发射。

神经元芯片
前几年有拿一整片硅晶圆做一个高仿鼠脑的（冰冻之后逐层磨了拍照抄板），号称世界最大模拟电路，记不得网址了
最近这个比较实用一些
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The Board: Neurogrid

Inspired by GRAPE-6, a $60K supercomputer that has revolutionized astrophysics, Neurogrid provides an affordable option for brain simulations. It uses analog computation to emulate ion-channel activity and uses digital communication to softwire synaptic connections. These technologies impose different constraints, because they operate in parallel and in serial, respectively. Analog computation constrains the number of distinct ion-channel populations that can be simulated—unlike digital computation, which simply takes longer to run bigger simulations. Digital communication constrains the number of synaptic connections that can be activated per second—unlike analog communication, which simply sums additional inputs onto the same wire. Working within these constraints, Neurogrid achieves its goal of simulating multiple cortical areas in real-time by making judicious choices.
Neurogrid
With sixteen 12x14 sq-mm chips (Neurocores) assembled on a 6.5x7.5 sq-in circuit board (shown above), Neurogrid can model a slab of cortex with up to 16x256x256 neurons—over a million! The chips are interconnected in a binary tree by 80M spike/sec links. An on-chip RAM (in each Neurocore) and an off-chip RAM (on a daughterboard, not shown) softwire vertical and horizontcal cortical connections, respectively [Rodrigo Alvarez 2009].

    Recent breakthroughs in neuromorphic engineering make it possible to combine analog's parallel operation with digital's programmability, reaping the best of both worlds.

Neurogrid simulates one million neurons with two subcellular compartments each, a choice motivated by neurophysiological studies. Nonlinear interactions between projections that terminate in distinct cortical layers have been replicated in a pyramidal-cell model with just two compartments. Furthermore, varying the compartments' electrical coupling replicates the firing patterns of various pyramidal-cell types. Capturing these behaviors using the smallest number of compartments minimizes the number of distinct ion-channel populations that need to be simulated, thereby maximizing the number of neurons a model can have.

    Neurogrid simulates a million neurons connected by billions of synapses in real-time, rivaling a supercomputer while consuming a 100,000 times less energy—five watts instead of a megawatt!

Neurogrid simulates six billion synapses connected in structured patterns, a choice motivated by neuroanatomical studies. Cortical axons synapse profusely in a local area, course along for a while, then do it again. Thus, nearby neurons receive inputs from largely the same axons, as expected from the contiguous (map-like) organization of cortical areas. Local wires running between neighboring silicon neurons emulate these patchy arbors using analog communication, invoking postsynaptic potentials within a programmable radius. A patch radius of 6 neurons, for example, lets a single softwired axon make a hundred synapses—increasing the total number of synaptic connections possible from 60 million to six billion.

日常的最复杂的估计就是模拟彩电和VHS录放像机了。

当然是IBM公司那个模拟人大脑的那个芯片了，

引用 石峻峰:
当然是IBM公司那个模拟人大脑的那个芯片了，

额，貌似回答错了，这个貌似不是模拟电路

0.001摄氏度分辨率的温控电路...

引用 pldtv:
0.001摄氏度分辨率的温控电路...

那不如0.1aA检流计

如果最复杂的数字电路是CPU  那最复杂的就是 模拟CPU啦

全分离原件的电视机和录像机，90年代的时候，修得让人崩溃啊，

引用 fusecn:
全分离原件的电视机和录像机，90年代的时候，修得让人崩溃啊，

的确分立元件彩色电视机非常的复杂！

图像处理电路

模拟电路的CPU

我觉得是分立元件的短波电台，那比电视复杂，比如icom 751a

模拟计算机吧